When I replaced my old one I bought one at the dealer (NOS GM, not a repop) and it was plastic. The original one was too because one of the studs that holds it on the lid was broken off and it was plastic too.
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RJD
1984 Chevrolet C30 welding truck 454/SM465
1977 GMC C15 pickup 350/TH350
1970 Chevrolet C20 pickup 350/TH400
1970 Chevrolet K20 Suburban 454/TH350
1969 GMC 8500 478M V6/5 spd winch truck
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