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I have noticed that most of the aftermarket torque arms have two sets of holes for mounting. What is the reason for this? I recently bought an older chassis mounted Spohn torque arm and it only has 1 set of holes.
On the rear flange that bolts to the axle, I believe it's to allow a wider application range, for stock 10-bolts and aftermarket 12-bolt and some 9" housings.