Marlow has a good point, they do supply a drill bushing with some light kits. Helps the "aim" I mentioned.
Matt, that's a really nice truck. Isn't that spotlight handle a head knocker when you get in truck?
BTW: Like 65% of all 57 Chevy Trucks, including $40,000 show trucks and Cameo's, the fender spears, in the picture I see, are on backwards.