Quote:
Originally Posted by edesign45
I'm not an expert on this but I do believe the rear shock towers are different (larger) on the 72-73 chassis. When using later aluminum trailing arms on a 69-71 911, a Bilstein style shock will bind/rub on the chassis do to the geometry of the shock angle. A more slender shock like a Koni Classic can solve this issue if you insist on using AL trailing arms. This is not an issue on a 72-73 chassis.
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This is a good point^^.
When I read the OP, I immediately thought he was concerned about differences between an "S" shell and any other model. However, rereading the post, that is not entirely clear. Subtle differences between shells during the production years of 69-73 may be what he is after.