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I can tell you first hand as I was involved in making the reproductions you pictured (In fact I took that very picture)




Scott, my apologies for not including the appropriate credit, I saved your photo a long time ago and didn't recall where I'd found it.

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and though I haven't seen every original set, I've seen at least a couple dozen that were fresh off the cars (70 & 71 E-body cars) and none of them had the welded on spacers.




That would support my theory the spacers were only on the B-bodies, maybe only the Charger? I know I've seen a couple other B's with 6-ways (a RR and a GTX) but I've no idea whether the same braces were used.

Nick, I'll check my floor pan and see if I have the plates on the underside of the floor pan. I know the ones on the top side are there.