54-56 Buick Spl trim differences

Strictly focusing on the side trim (check mark, spearcheck), what , if any, are the differences between the 54-56 years on the 40 Series/ Special cars

Mainly researching 2dr. I presume coupe & hardtop would be the same regarding the side trim,, no?

 

As far as I know from talking to Buick dudes at car shows and stuff, as long as it is a 40 or 60 series the trim is the same. I have collected a few pieces for my 55 and have had good luck so far.