I bought some new headlight lenses for my 41 willys and they require me to cut out some of the fiberglass fender in order to fit the new buckets that I am installing in the back. I am a little nervous about cutting into painted fiberglass, but it does not have to be perfect due to the lense covering the area I am cutting. What kind of cutting wheel should I be buying at the local paint shop? This is the first time I am doing something of this sort, but I figure that if I am careful I should be able to tackle it.