95 GSR 4th and 5th in 93 YS1...

WIth that upgrade, do I use entire set out of the 95 GSR? IT’s the #12 on the link below. Basically, should I use my 92 GSR #12 or use the 95 GSR #12?


#12 is the reverse gear brake synchro. Thats not what you need for a different gear ratio.