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You're not getting good answers because not many people know, but it's a totally worthwhile swap because the late rear wheel bearings are way better. Plus you can put in bigger torsion bars while you're at it. Early 85/86 "should" be able to swap just the aluminum arms and you'll have the same axle width. 87 and later I would buy EVERYTHING including the torsion tube. My friend tried to switch just 88 arms into his 84 and found the spring plates and a bunch of other stuff was wrong. Parts should be cheap enough that you could easily buy the whole assembly. People parting out cars probably only get $200 for the entire rear suspension because nobody ever buys it piecemeal. For that reason I'd buy the full meal deal no matter what year/offset you decide on. The mounting points to the body are all the same.
The 87 and later stuff is nice because you can use all the late offset wheels- C2, 993, 996 etc. but you'll have to use spacers up front because that axle will still be narrow. If you have 31mm torsion bars I think you can still use early offset wheels and they'll completely fill the fender and not rub.
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dude
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