it depends on the size of your aftermarket lights, but i just made some tabs out of stock, drilled them and shaped them a bit with a bench grinder, rust painted them black and added them like washers to the lower triple tree bolt setup.
in the back i welded tabs into the frame, but if you have kept the original rearframe setup, then you can make tabs and use them like washers for the bolts like the front.
this picture shows where my lights are at, but doesn't really show the tabs (they ain't fancy anyhow).