I added these to my 128 about a month after I dicovered the cut outs for them under the dash. You can go to the dealer and just order them from the parts dept. I wired mine through the ashtray light.
Found these on ebay, which are the same as the dealer part.
http://cgi.ebay.com/ebaymotors/LED-C...A1%7C72%3A1171