Are you looking to upgrade your Pre-1992 BMW radio to a newer version such as the Alpine C33, Business RDS, C43 Business or CD43 Business CD radio that were installed in the newer 1996+ models? You will require an adapter harness so that your job is a plug and play!
Genuine BMW E30 E31 Adapter TUBING F Stereo AND HIFI System OEM
Please make sure to check if you have a 4-Channel radio or a 2-Channel radio.