Drilling holes in fiberglass???

[Kafer_Mike]

I just received my CCC fiberglass fenders in the mail this week. :agree: My question is what is the best bit to use to drill out the fender mounting holes? CCC suggested a "dull drill bit". I was wondering about a step drill (like is used to drill holes in sheet metal) or a fine-tooth hole saw. I see quite a few fiberglass fenders around here. What did you guys use???