I had the SMM lift bars on mine when I bought it. Those look similar from what I can see. Switching to stock boxed arms with rubber bushings sure improved the ride quality. With the SSMs on you felt every little bump. The bushings in the SSMs had no give at all and with a 4 link system something needs to give to allow the rear wheels to move some what independently. They're not independent but with the SSMs a bump on one side was transmitted directly to the other side.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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