Brake drum question

They came off my car. They're called mine,and I want 'em back. lol

They were part of the Trailer Towing pkg,found on 67up A-bodies;Option Code 359(67/68).They might have been part of other pkgs, as I have found them on 340 equiped; Swingers,Dusters, and Demons, without hitches.
I thought they were part of the Rallaye Group, the Formula S group, and the Cuda Group, but find no references to support that.
They were available separately as code B11.