Originally Posted by Ryan1212
When I got my E30 the shock mount was two separate pieces, causing the shock to float around for about an inch before it would do anything and made an impressive clunk in the rear, so this would be my vote. New ones are dirt cheap, I got the NAPA HD ones and they seem good so far.
The E46 OEM versions are stronger, or look for Mahle HD version. They have a sort of 'barb' to prevent the rubber separating from the metal. Changing them on a coupe/sedan is a breeze.