Customs 1955 Buick Roadmaster Interchange with Special, Century,Super

I have a 55 Buick Roadmaster that needs a replacement rear bumper along with tail light housings, some exterior trim and hood ornament.

I am trying to find out if the bumpers on the 55's are all the same or will only a roadmaster or super fit. Are the Specials and Century's too narrow?

Are the tail light housings specific to the 50 and 70 model or can the 40 and 60 model work?

 

You have answered your own questions. Roadmaster and Super parts interchange, but not with Special or Century.