Hmm, when I ordered Bilstein shocks for my 1967 Barracuda from PST, they supplied 55-R093 for the rear. I don't know what the difference is supposed to be, but the upper bushings on the ones I received had 5/8" diameter holes — the studs are 11/16". I had to drill out the shock bushings.
Yeah I think PST messed up there when I looked at my 73 duster on rockauto for shocks it takes the same rear shock as your 67’ barracuda so I believe you should have had the R092’s
