Jas,
If you can get the volume control out of the radio, you might be able to find a part number, and if you can find a part number, you might be able to find the part from someone like Digi-Key.
https://www.digikey.com/products/en/...s/encoders/507
Salty
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2006 BMW Z4M Interlagos Blue/Black
Aux Port|LED Interior|LED Strip Trunk|Underseat First Aid Box|Stubby Antenna|Intravee II|BMW Oil Change Kit|Top Down Side Panels|Vibra Technics Engine Mounts|Rogue Trans Mounts|Engine Mount Bolts Upgrade|RS Windblocker|Euro Front Plate|M5 Illum Shift Knob|Supersprint Powerloop Exhaust|Gruppe-M Intake|RPI Scoop|Black Grills|19x8.5 ET35 F 19x9.5 ET22 R Sportline 8s PSS| Besian Vanos|CDV Delete