Just fitted a Dolphin system, quick and easy took about 3 hours on a B-CLASS. Came with everything you needed. Including drill bit. Best thing is when you take the bumper off it shoudl havemarkers where the factory units woudl go it. So you just drilla small pilot through from the inside and then drill again from the outside to get a clean cut on paintwork.
Makes whole job much easier then measuring and trying to find where to mount them. I have checkd this and my E90 had them on front bumper so rear woudl do as well. The merc had them front and rear.
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F30 335i M Sport - now departed
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