I used the 1/4" not version as it came with my compressor kit. I stacked 2 1 1/2" fender washers under the vowel cover then tightened the hose fitting to clamp it down nice and tight. The wider base with washers give wider support over the locking nut on the mic version
I have the BD S2 pro spot on mine....and here they are at night a bit of hood glare, but not bad, I find I get more annoying glare from any fogging on the windshield than I do the hood