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http://dyeager535.topcities.com/partsmanual.html Listed, but no part numbers. The .xxx number is the group number IIRC, so that might get you the part number from the dealer. Then just plug that part # into gmpartsdirect.com.
Personally, I think I'd be looking for a used one, thats just one of those parts that doesn't wear out, that is probably $50+ new.
I was able to just go to the dealer and ask for one. They had it on hand. I looked everywhere for one in a yard, but none of them were really in good shape. They're pretty thin, and most were really beat up. I think it was around the $15 range IIRC.