i sell alarm parts for prewired car and also probably can make one wiring harness
https://www.e90post.com/forums/showthread.php?t=1449882
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E81 2007 130i 6cylinder Montego blue
Retrofits: Harman Kardon, High-beam assistant, Removable tow hitch. Auto-dim folding exterior mirrors. Lumbar support. Perfomance Brakes.