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i just drilled a hole and you can reach on the underside and tighten the nut with no issues. mine are 4 inchers. mine are bright as **** for being that small. they have different beam patters, i got the driving light beam but they have a smr beam i think for offroading.
I was at an outdoor expo in Milwaukee WI this weekend and a company made a bracket that mounted behind the licence plate and was able to hold 2 lights i think it was like 20 bucks and looked pretty cool.