Stumbled across this earlier, might be useful if anyone's looking to go back to OEM:

•BMW Bavaria C II - Blaupunkt BP9455
•BMW Bavaria C REVERSE II - Blaupunkt BP9475
•BMW Bavaria C Business - Becker BE0774
•BMW Bavaria C Professional - Becker BE0776
•BMW Bavaria Electronic CD - Blaupunkt New York SCD08
•BMW Bavaria C Business RDS - Pioneer KE-92ZBM
•BMW Bavaria Electronic CD II - Blaupunkt München SCD09
•BMW Bavaria C Reverse RDS - Blaupunkt BP1836
•BMW Bavaria C Professional RDS - Becker BE1801
•BMW Bavaria C III - Blaupunkt BP1830
•BMW Bavaria C Reverse III - Blaupunkt BP1835
•BMW Reverse RDS - Blaupunkt BP4836 (early) / Blaupunkt BP6262 (late)
•BMW Business RDS - Philips DC785
•BMW Business CD RDS - Blaupunkt CD23
•BMW Professional RDS - Becker BE2450
•BMW Business CD - Blaupunkt CD43