I have 924S (944) alloy arms with spax PSX kit dampers on the rear of an '03 bug. The set up is use the standard 12mm top bolt and ream the bottom bush to 14mm. The amount of metal left is acceptable in the metal bush especially as the damper is not under load unless you use a coilover. If you are using coilovers then its a different ball game in anycase and certainly the 12mm top mount is not sufficient to tat the loadings of anything more than a helper spring.
evilC
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