Fiberglass help

I would match the parts up, drill holes and use your existing j clips. Then any area that mates up with the fender use a good glue made for fiberglass repair. A good glue to use would be the "duramix" system although I think 3m has taken over that product line so the name may have changed. Make sure you do the final gluing while the bucket and fender are mounted with your fenders adjusted to the hood. If you fuse them solid off the car you will possibly lose your fender adjustment.