help please: identify these 55 plymouth parts by their numbers

[jerrybev]

aluminum moulding I am told is for Belvedere, what is it and where does it fit:  1593863

Fancy  chrome moulding part # 1579940  SC  and
                                            1579941  SC
they are a left and right pair.   These are part of 15-20 items NOS  1955 plymouth parts that I want to put on ebay right away and it would be helpful if I could explain what the fit.
thanks for your time and help.
Jerry Whitfield
Winston Salem, NC