Originally Posted by pshovest

There are several inexpensive BT--->Aux options.
I use https://www.ebay.com/itm/Wireless-Bl...IVZ3T1PXtkziQw
in my E36 & E39 that only has aux input. Works well and I can stop/start music without touching phone. Also works well with Waze for driving directions. It plugs into cigarette lighter socket. The FM transmitter is disabled when aux cable is connected.

If you don't want to see adapter and don't mind manipulating phone to start music then this
https://www.ebay.com/itm/3-5mm-Mini-...UAAOSwOMdZP4dz
will fit in the console. Same functionality as above. It plugs into USB charger in console socket.