Not sure which ones need replacement. Front or rear. Regardless, I went to eBay for oem, but certain parts such as front turn signals with their base plate don't seem to come up often as the rear ones.
If you can't wait and want to go to once source, check out
https://www.kawasakipartshouse.com/o...x250-f19-parts
Brand new oem parts aren't cheap though.