I installed Fairchild Industries outer door belt strips. They seem to be the closest to GM available. The felts are properly riveted to the strips, and they fit great. They were under $50 a pair.
https://www.ebay.com/itm/Fairchild-I...72.m2749.l2649
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey
1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles
2017 Sierra SLT 1500 Z71 4X4 
2019 Canyon SLT Crew 4X4 
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