I'm interested in perhaps a 1990-1992 735i, so I've gathered information about 735's and 750's from similar years. My questions are, at what year did they darken the trim? I noticed a 1988 735 has a very light color, however a picture of a '91 750 showed a much darker color. Did 735's ever get chrome inside door handles, like the 750's? Did 735's ever get wood ashtray drawers and wood around the shift knob? Anyone ever noticed differences in the radio and OBC from 1998 to 1994 and maybe tried to update? A little off topic, but what type of differential (ratio? open/LSD?) is found in a 735i? Any information is appreciated.