Need some help on headlight wiring. Also trying to find a cheap keihin fcr 35mm carb

I just got a klx 300 and it had a headlight in place of the front number plate but not hooked up. Thats what I'm trying to do, The bike already has a regulator/rectifier on it and a couple of spots where wires that aren't hooked to anything. Is anything special I need to hook it up, I tried to hook it in to those places but it didn't do anything.

Also I'm trying to find a keihin fcr 35mm or 37mm pumper carb. preferably a 35mm supposedly fits and mounts better and easier with no mods. What all bikes came with them stock? I'm looking to find one cheap like 100 bucks and less just incase the performance isn't what i'm looking for, I've tried ebay but they're pricey..... Gotta get rid of this cvk carb thats on it.
Any help? thanks
 
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