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The '89 964 C4 was a 1 year flywheel before the switch to dual mass. The overall shape is similar to the 3.2 flywheel, but with 60-2 timing teeth for the 964 DME. I believe it used the 3.2 rubber centered disc and clutch setup or equivalent. The RS style single mass is a more dished shape and requires a different clutch and extended TOB. I believe I have one of each type in storage. Any of the 3 flywheel types could be used as long as the matching clutch package is used.
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