Stop in for a cup of coffee

Rani I want to pick your brain on 7 1/4 rears the one I have in the belve has 5 mounting holes drilled for the backing plates and the bearing retainers and it also has 15" sbp wheels is this thing special somehow I have never seen this before but I am a 8 1/4 guy. Just seems weird.
Ray, You sure they are SBP? Surfin around and consensus is they were never available from factory and neither was 15" on a 66 Belve....
But we all know Mopar was known to do WTFTP for special order. Did find a post of someone having centers swapped to make a set.