Got both sides from a 58 E-400 pulled from a 4 dr HT that was crushed after I got all the pieces I wanted.
Manifolds-- Free if you pay shipping" I''ll also check tomorrow if another will have the same outlet pattern from a truck or early car if I haven't scrapped them yet.
I've got quite a few rectangle log exhaust manifolds in a pile so i'll have to look a numbers.
I'll repost tomorrow with my findings.