Technical 1955 Merc back seat questions (and tail lights)

Missing the back part of a 2dr ht Monterey. Would the back of the seat from a 4 dr Montclair or Monterey be the same? Does the 2dr ht Montclair have a split back seat with a speaker in the middle at the top? Would anyone have any tail lights for a 55 or 56 or know of any bolt in custom applications? TY!

 

With some other makes, the seat is different between 2 and 4 door cars because of the arm rests. Any thoughts on the 55 Merc? Thanks

 

I'm guessing but I would think 55 and 56 would be the same. In general 4 drs are usually different from 2 drs.