I've installed some on an early swingaxle setup, and had no problems ... As VWChris says, longer hardware makes the job much easier, even if you only use the longer bolts to get it the cover on and then put the short bolts back.
Use alot of lube on the urethane or the squeeking will drive you CRAZY.
Let me say that again, \"use ALOT of lube on the urethane\".
Cheers.