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			You can lower the rear about 7/8" or 21-22mm with the two nut/bolt combination, rear of the torsion bar housing.  The front one A, is the locking nut, B is the rear one and it is the eccentric and this is the one to turn.
 Scribe a mark on the outside piece where the nuts(24mm) are.  Break A, then B and see if you move the head on B, if not then loosen a bit more.  To lower the ride height, this mark will need to be lower than the mark on the trailing arm piece.  The bolt head will get some spring in it when you approach the limit so have the pull bar ready to tighten the nut.
 
 This is just a way to get the car a little lower in the rear without reindexing or changing the torsion bars.  Good luck
 
 
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