Hi guys just asking for a bit of advice here.I have a 91 nsr 250 r7l which I use as a race bike in f3 in NZ.I have just replaced both cylinders on this bike almost,I checked the parts numbers on this site and my cylinders that i ordered are for a mc 28 250 r2r and the piston rings for the rr.its not a problem exchanging and re ordering but are these items inter cangable on these bikes i've already checked the tyga site but not enough info hope you can help as i want to get racing.This bike is an r model not an SP Thanks Bruno.