You are right, manual and auto seats have different bolt pattern, what you need to do is, build yourself a 2 holes extension, and no there are not any missing, also the track you bought what year did you by it out of, and as to your questions arent all e23 the same, no they are not they changed about every 4 years, so can can figure the math, if I can be of any more help, feel free to E-mail me.