The L322 was fitted with a Siemens BT 2G handset which connected to the electronics in the rear.
Below is the original Siemens unit beside the BMW ULF.
Phone vs ULF.jpg
The Siemens has two connectors on the bottom cf. the ULF's single. The F-type connector is for the GSM antenna which is up in the rear spoiler. The other connector goes to the small antenna in the car which connects to the handset. This antenna will be replaced by a very similar Bluetooth antenna (see later).
Phone vs ULF Antenna Sockets.jpg
Note the difference in size. The new ULF mounting tabs don't match up to the Siemens' mounts. However, there is a smaller (4mm) threaded hole just forward of the rear-most mounting tablocation and that lines up nicely with the ULF's tabs.
ULF top mounting holes.jpg
To prevent vibration, I will use double-sided foam tape lower down on the ULF to stick it to the mounting panel.
ULF tape on rear.jpg
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