Ah ok, now I found it. they have a holley part number, 97-150, and gm number, 12564401.
The Holley part is just 37 bucks. Or 50 from GM with all washers and the bolt.
It does appear to be the same as the smooth idler by the alt, so I can just use the spare one I have or I may have one left over from when I put the blower on my CTSV.
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