I'm also a fan of 4 door sedans (and wagons), often preferring them to the 2 door HT. I've always wished their were more in plastic but have learned not to hold my breath.
I have this promo-based Johan 1962 Oldsmobile Super 88 4 door. I bought it as seen in the photo, built but without paint or even glue. (It came in its box too but I don't have a photo.)