There shouldn't be any difference if the arms are stock. What do you mean the metal cup is too big? As for the bolt holes I replaced mine back in 04. Don't recall if I had to ream the holes a bit get the bolts through, too long ago. I wouldn't be surprised though if they did need a little massaging since the originals were riveted in.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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