yes just minor trimming mostly where the plate meets the top of the fender,and a little on the sides....little bits at a time,trim it,fit it,mark it,and trim a little more until it was tight.Just take your time and go slow and you'll get a perfect fit.
Your bike being a 99,,,you may get away with alot less trimming if you use your stock number plate than I had to.My stock 95 front number plate is different than the 99-2000.95 came with 3 bolt mounts,I think it changed in 97 or 96 to just one bolt mount,so that's why I had to do most of my trimming.
Foxx