Does anyone have any idea how to tell what the upholstery code in a 240 means? This is stamped on the data plate below the paint code. It appears to me that the first digit may be the number of doors, i.e. a 240 wagon (245) would begin with a 5, and a sedan would begin with either a 2 (coupe) or 4 (full sedan.) After that, though, I'm at a loss. Has anyone determined what the remaining three digits mean?