wow that is a cool shifter. where can I get that one? here is what I did
went on ebay, and bought an auto shift assy from a 96+ 325i (which is what I have but mines '94) then everything is pretty much swap out the old and in with the new as they are identical except for the shift shaft is shorter on the new one. first take off your handle 3MM allen. then take off the shift cover....the P N R D 3 2 1 thing with a butter knife. pops right off. from there is 3 10MM bolts holding down the shift assy. 1 10MM bold holding down one of the 3 shift linkages and one 18MM bolt holding in the main shift linkage. 2 wire harnesses to unhook and wiggle out the shift assy out of the main hole. it take a little finesse to get it out of that shift hole, but it will come without removing the console! put everything back the way you took it out and you are set. to help in the removal process, I did pull out the OBC and the glasses tray, but you dont need to. shortly I am going to be doing a write-up with pictures and whatnot, I will post it here.
one thing I didnt mention, cause I dont know if you have to do it with other setups, I had to file down the bottom of that part sticking out of the new shift knob. if you see the pictures you posted for that knob, the shaft coming out, had about 1/2 inch....well I couldnt move from any position when I installed the new knob after everything was done, cause it was to long keeping the button pushed all the way in. so I filed about 1/4" off the shaft and that seemed to fix my problem. anyways have fun with it!