As far as I know interior kits are not avail for our cars so I have saved as many pict. as possible from original cars on e-bay ect to use as a referance. Cant say for plymouth but Dodge had what was called a confidential bulletin and in one of the bulletins I have there is a breakdown of what the interior color and material was according to prod. #. I am sure yours was one of three materials, mohair, leather or bedford cord. I should say I am assuming that those were your choices, that was the only 3 avail for my line. I am sure that I can be a big help if you ever feel like getting it really correct. I have spent a great deal of time studying interiors and the many interior fastners associated with our cars. If you want my e-mail let me know.