Did all 68-70 B bodies come in post and hardtop versions? OR was there a model, like 68-70 Coronets, that just came in post (post meaning a b pillar and pop out rear windows).

Sedans are a whole nother animal. I know sedans as a 2 or 4 door with a frame around the door glass. Think some people mix up the sedan/post/coupe as the same. I know one of the weatherstrip companies admitted they don't have a firm handle on the terminology.