I bought a rear seat cowl for less than 35 USD, from aliexpress.com, including delivery. The price for the windshield was about 14 USD. (Unfortunately I have no link to a picture, but I can send it if anyone request it.)
The price was less than 10 % of what I found for similar parts at www.kawasaki.no, with no delivery included.

Have you received them?

How's the quality? Color match? Fit?

I'm very skeptical of Chinese aftermarket stuff.

Have you received them?

How's the quality? Color match? Fit?

I'm very skeptical of Chinese aftermarket stuff.
Yes, I received both parts. Both parts fit perfect. I have only used them for a week or two, but have little or nothing to complain about this far. The color of the seat cowl is slightly darker than the lime green surroundings, but not much. The bike was bought in 2012, and the color might have faded somewhat. I have driven 25000 miles, in rainy Norway.. When parts from www.kawasaki.no cost more than 10 times as much, it was a simple choice.

Mind if we get some pics?

Been thinking about a Double Bubble for the ol' 250, and a rear seat cowl for giggles.

Looking forward to seeing if I should get them!

Are these the same ones you purchased?

Rear Seat Cowl (https://www.aliexpress.com/item/blue-For-Kawasaki-Ninja-250-R-ZX250R-2008-2010-2011-2012-EX250R-Rear-Seat-Cover-Cowl/32801439254.html?spm=2114.01010208.3.58.771vdJ&ws_ab_test=searchweb0_0,searchweb201602_3_10152_10065_10151_10068_5010016_10136_ 10137_10157_10060_10138_10155_10062_10156_437_10154_10056_10055_10054_10059_303_ 100032_100033_100031_10099_10103_10102_10096_10147_10052_10053_10050_10107_10142 _10051_10084_10083_10080_10082_10081_10110_519_10111_10112_10113_10114_10181_101 83_10182_10185_10078_10079_10073_10123_142-10050_10102,searchweb201603_9,ppcSwitch_7&btsid=b023ffa2-96d5-4969-abd9-8986e7eff7e2&algo_expid=f1b5d0e9-3d98-44e1-9455-47bc53159eaf-8&algo_pvid=f1b5d0e9-3d98-44e1-9455-47bc53159eaf)

Double Bubble Windscreen (smoke) (https://www.aliexpress.com/item/HotSale-For-Kawasaki-Ninja-250-EX250-R-ZX250R-2008-2009-2010-2011-2012-Windshield-WindScreen-Double/32806170877.html?spm=2114.01010208.3.163.Ps4eYr&ws_ab_test=searchweb0_0,searchweb201602_3_10152_10065_10151_10130_10068_5010016_ 10136_10137_10157_10060_10138_10155_10062_10156_437_10154_10056_10055_10054_1005 9_303_100032_100033_100031_10099_10103_10102_10096_10147_10052_10053_10050_10107 _10142_10051_10084_10083_10080_10082_10081_10178_10110_519_10111_10112_10113_101 14_10181_10183_10182_10185_10078_10079_10073_10123_142-10102,searchweb201603_9,ppcSwitch_7&btsid=f70ce9b9-1b62-4860-b953-3867110596d8&algo_expid=cef0dcb3-47c7-42d4-94cf-a8362f08cb7c-22&algo_pvid=cef0dcb3-47c7-42d4-94cf-a8362f08cb7c)

Mind if we get some pics?

Been thinking about a Double Bubble for the ol' 250, and a rear seat cowl for giggles.

Looking forward to seeing if I should get them!

Are these the same ones you purchased?

Rear Seat Cowl (https://www.aliexpress.com/item/blue-For-Kawasaki-Ninja-250-R-ZX250R-2008-2010-2011-2012-EX250R-Rear-Seat-Cover-Cowl/32801439254.html?spm=2114.01010208.3.58.771vdJ&ws_ab_test=searchweb0_0,searchweb201602_3_10152_10065_10151_10068_5010016_10136_ 10137_10157_10060_10138_10155_10062_10156_437_10154_10056_10055_10054_10059_303_ 100032_100033_100031_10099_10103_10102_10096_10147_10052_10053_10050_10107_10142 _10051_10084_10083_10080_10082_10081_10110_519_10111_10112_10113_10114_10181_101 83_10182_10185_10078_10079_10073_10123_142-10050_10102,searchweb201603_9,ppcSwitch_7&btsid=b023ffa2-96d5-4969-abd9-8986e7eff7e2&algo_expid=f1b5d0e9-3d98-44e1-9455-47bc53159eaf-8&algo_pvid=f1b5d0e9-3d98-44e1-9455-47bc53159eaf)

Double Bubble Windscreen (smoke) (https://www.aliexpress.com/item/HotSale-For-Kawasaki-Ninja-250-EX250-R-ZX250R-2008-2009-2010-2011-2012-Windshield-WindScreen-Double/32806170877.html?spm=2114.01010208.3.163.Ps4eYr&ws_ab_test=searchweb0_0,searchweb201602_3_10152_10065_10151_10130_10068_5010016_ 10136_10137_10157_10060_10138_10155_10062_10156_437_10154_10056_10055_10054_1005 9_303_100032_100033_100031_10099_10103_10102_10096_10147_10052_10053_10050_10107 _10142_10051_10084_10083_10080_10082_10081_10178_10110_519_10111_10112_10113_101 14_10181_10183_10182_10185_10078_10079_10073_10123_142-10102,searchweb201603_9,ppcSwitch_7&btsid=f70ce9b9-1b62-4860-b953-3867110596d8&algo_expid=cef0dcb3-47c7-42d4-94cf-a8362f08cb7c-22&algo_pvid=cef0dcb3-47c7-42d4-94cf-a8362f08cb7c)

A picture of the bike should hopefully be here:
https://www.mcsiden.no/viewtopic.php?f=16&t=4839&p=321039#p321039
The seat cowl was from the same shop, I believe. The price was lower at the time. The windshield might also have been from the same place, but I don't remember exactly. Might have been from here: https://www.aliexpress.com/item/New-For-Kawasaki-Ninja-250R-2008-2011-2009-2010-08-09-10-11-ABS-bike-motorcycle/32647303177.html?spm=2114.01010208.3.36.kyaQDe&ws_ab_test=searchweb0_0,searchweb201602_2_10152_10065_10151_10068_10171_10084_10 083_10080_10082_10081_10110_10136_10137_10111_10060_10138_10112_10113_10155_1006 2_10114_10156_10154_10056_10055_10054_10059_10099_10078_10079_10103_10073_10102_ 10096_10070_10148_10123_10147_10052_10053_10124_10142_10107_10050_10143_10051-10102,searchweb201603_9,afswitch_1,ppcSwitch_7&btsid=8a250a2d-4808-4d03-8b28-20d787efc48c&algo_expid=9556964f-9863-46e8-8b26-93924849b82f-4&algo_pvid=9556964f-9863-46e8-8b26-93924849b82f
Both parts were definately bought at aliexpress.com, though.

Have you received them?

How's the quality? Color match? Fit?

I'm very skeptical of Chinese aftermarket stuff.

Maybe not very easy to see the color, but you may get some impression from the picture of the green Ninja at this page:
https://www.mcsiden.no/viewtopic.php?f=16&t=4839&p=321039#p321039

Thanks for the feedback, just put in my order today. 5/29.

https://www.aliexpress.com/item/HotSale-For-Kawasaki-Ninja-250-EX250-R-ZX250R-2008-2009-2010-2011-2012-Windshield-WindScreen-Double/32806170877.html?spm=2114.13010308.0.0.B8BU7h

Seller: AlexanderMoto $17.50 incl ship.
I'll put a mini review once I get it.

I'm skeptical about Chinese stuff too. Decided whether my skepticism is worth anything, and there's one way to find out!

Thanks for the feedback, just put in my order today. 5/29.

https://www.aliexpress.com/item/HotSale-For-Kawasaki-Ninja-250-EX250-R-ZX250R-2008-2009-2010-2011-2012-Windshield-WindScreen-Double/32806170877.html?spm=2114.13010308.0.0.B8BU7h

Seller: AlexanderMoto $17.50 incl ship.
I'll put a mini review once I get it.

I'm skeptical about Chinese stuff too. Decided whether my skepticism is worth anything, and there's one way to find out!

Good luck! It might not be as good as the official Kawasaki stuff, but in my case, the price difference is tremendous.
On the norwegian Kawasaki pages, a lime green seat cowl costs 2064 NOK.
2064 NOK equals about 2064 / 8.433 USD = 245 USD.

So, from the norwegian Kawasaki dealership such a part costs about 245 / 17.5 => 14 times as much. That made the choice easy for me, and I can live with the lower quality.

To make a comprison: Such a seat cowl costs about the same as the cheapest
plane roundtrips between Oslo and New York (2198 NOK) ( as can be seen here, today: http://www.flybilligst.com/index.php (upper right corner)).

I'll rather buy the cheap chinese part, and take a trip to New York for the "rest" of the money, for example.

^^^^^^^ travel :dancecool:

Windscreen received yesterday. 6/14. From Guangdong. I think that's near Hong Kong.

Anyway I won't be posting pics just yet, my bike is getting serviced once I get it back I'll take some pics with the shield off the bike, on the bike, see if I can weigh it and compare it to the old screen. It looks fine really. Pretty lightweight, a light smoke color to it. See one extra plastic tabs sticking out from manufacturing, but it's really OK considering the price. I can get a nail file and scrub it off no problem. Will see how install goes and if the holes line up once my bike comes back.

I would be interested in a side by side picture as well to see how much extra "bubble" is in the new screen.

Rode with the new windscreen for 200 miles. I'll keep it short.

Measurements:
OEM - 3 5/16 "
New - 4 "

Didn't weigh it, if somebody wants that info I can do it. They're both light pieces of plastic. Has a good fit. Had to reuse the rubber mount pegs from the old windshield.

Comparing the highway rides, noticeable change in the wind deflection. The wind hits about 2-3 inches higher on my helmet (5'8"). This can be a pro / con. Pro, less wind. Con, hotter helmet. Previous windscreen hit right under the helmet. New one hits somewhere on my visor. This is going 80+ mph. Air flow is smooth.

It's a noticeable change. For the money, I think it's a fun thing to experiment with. The construction is solid; I wouldn't worry about it breaking. The bubble doesn't seem very large, but there is an effect. Maybe a Double Bubble has a bigger bubble, and that may be what you're looking for. For me, for the cost, the value proposition is there. And it looks cool!

I love ali, the deals are amazing!bet group buys would be easy!