I use these for Pontiac when I can't get the Crowers.
https://www.compcams.com/magnum-roll...-65-ratio.html
They aren't the Ultra Pro's but they are still the 8620 chrome molly and have worked fine for me. Better than the knock off stuff and better than aluminum. They even tell you in the listing to make sure Comp is stamped on the bottom of the rocker, there are a bunch of copies out there.
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2019 Pontiac Heaven class winner
https://youtu.be/XqEydRRRwqE