^ I don't know about that, from my experience there's some stuff you can buy for the older models like clip ons or rear sets and other little stuff. On the other hand, with the newer 08-12 models you can buy the same parts with more variety.
On top of my head I can name a few exhaust for the 08-12 model: Area P, tyga, scorpion, Yoshi, Two brothers, V&H, Leo Vince, Akrapovic, and FMF. I don't know if the pre-gens even have that kind of option. Same thing with Buble wind screens, frame sliders, racing fairings, Marchesi wheels, and 17'' tire selection for the newer models.
I could be wrong, there are many sites you can buy parts for these bike bike. Revzilla is a pretty good one. I saw some parts for the older 250s. Motorcyclesuperstore is OK, but after they keep giving wrong parts,so I kind of stop buying from them. (MST) gave me a Yamaha sprocket by accident, and when I returned it, they charged me restocking me. Revzilla doesn't do that.
1. SLK 230K AMG SPORT
2. VW RABBIT 2.5
3. 08 Ninja 250R Track Prepared