What about these? (on ebay...not mine, just found them w/a quick search).
I don't think anyone repros these with both the rotating integral sleeve and the Torx head.
Note: There seem to be plenty of the NOS GM Torx version.....WITHOUT the rotating sleeve. But probably incorrect for what you need. I'm not a Chevy/Camaro expert
but have dealt w/buying these occasionally for Olds and Buick customers.
AMK Products used to show them in their repro fasteners, etc catalog but I asked them a few times about them and they apparently never had them made.
ebay link:
https://www.ebay.com/itm/17604795647...d48747c6d56d2c