As I recall there are at least 2 different ( & possibly 3) variations of those Idler arm and support combinations. They all do the same thing, but it matters which arm will thread onto, or not, it's support post.
I have also seen inexpensive "field repair" kits sold by aftermarket companies to help take up some of the play in the threads after, say the car is 10 or 15 years old.
You can sometimes find these aftermarket kits on ebay.
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Peter Serio
Owner, Precision Pontiac
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