I have an early 65 sb convertible. Built first week in Jan. 65. Maroon/maroon vinyl. On the trim tag after Trim is the code 435 which is for maroon vinyl. This is correct. Now, after the 435 is the letter B. According to Nolands book there should be two letters. There is no second letter. This is an AO Smith car. Does that explain it? Or, did the factory forget the second letter. Has anyone else seen this on a trim tag before? What does this lonely ECL code B represent? Anyone? Thanks! DG