I've heard that the quality of the reproduction rear drums is terrible, cracking, poor runout etc. If you really want them I would look to the below link. The guy takes stock drums, cuts the old steel liner out and presses a new steel one in, then machines. New steel liners come from a foundry in WI.
J&G Brake Drum Relining & Refurbishing | GM G-Body
Brake drums for classic GM G-body vehicles by J&G Brake Drum Relining and Refurbishing.www.jgrelining.com
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