I have mostly older "K" cars, have never owned a 3r... but at one time charted this all down.
The rrEvo was the first to come with the 08 gears, you can convert an r or rr to these. The fw-05 came out about the same time and also used the same pitch.... but the pinions are a lot bigger... "I think" ... seem to remember the clutch bell being the same... but the 2nd pinion on the rr is the same as 1st on the FW.
The 3r uses a different clutch bell with an even smaller 1st pinion... but I'm pretty sure 2nd is the same as 1st on the rrEvo. You can't use the 3r clutch setup on the older models. The pinions are to small... to far away... never get them to mesh with the spurs.
PS, you might want to ask this thread be moved to the proper place.