18,000 orig. mile 318 build
Forgot this was an F body.
'76-'80 Aspen/Volare
'77-'81 LeBaron
'77-'89 Diplomat
'82-'89 Gran Fury
'82 New Yorker
'83-'89 New Yorker Fifth Avenue
'80-'83 Mirada/Cordoba/Imperial
All body styles have the same perches. Pretty sure all wagons got 8.25s, most all cop cars did. 360 cars also automatically got 8.25s. Other than that, check- lots got them. People often like to make '65-'70 B body rears fit, the perches are about .23" off on each side so it's not a huge deal.
If you can't find an M or B rear, you can move the perches outboard on a Jeep 8.25/Explorer 8.8 or something like that. Dakota 5 lugs ('90-down) might be a valid donor too.