Yep, the rear counterweight has to be matched to the year of the rotors. Otherwise you will get nasty vibrations that will eventually tear the motor apart.
For my 12a, I went with a lightweight steel flywheel along with the correct counterweight. Then added a nice clutch originally designed for a 13b.
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"Learn from the past, or it will become your future...."
'85 GS 12a + LSD/Sterling carb/Respeed coilovers/Respeed front swaybar/Respeed adj. rear spring perches/Illuminas/Bilsteins on rear
AutoX vids @ http://www.youtube.com/user/Kentetsu1
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