Welcome.
Google is your friend... look for "2005 Ninja 250 fender eliminator"
I found this for starters.
https://www.xdcycle.com/discount-mot...Trick-Kit.html
You'll also find a bunch of DIYs if you search around. Look on Youtube and in this forum.
Not exactly sure what you're asking for re the tail light... assume an LED unit. Didn't find one of those with a casual search, but did find smoked lenses if all you're really looking for is a different look.
https://www.xdcycle.com/discount-mot...ht-Lenses.html