I have seen a few that were decent, US Body Source "Heavy Duty" units were all pretty nice stuff, doors & fenders, also Hoods & trunks lids, the Race units are very light weight... They aren't like the newer steel replacement panels, they do need a little more fitting work, nowhere near as bad as the old 70's-80's stuff thou... Harry's Glass, Unlimited Products Fiberglass, Fiberglass Trends, WS Racing Fiberglass, Sled City, VFN & AAR Fiberglass, I think all make some decent fiberglass replacement panels & parts, some parts/panels better than others, some cheaper than others too, not all of them make fenders thou, most make at least, Hoods, Trunk lids & Bumpers, some do &/or will make Doors & Fenders & even full Bodies too... You really do get what you pay for especially with Fiberglass panels, the cheaper stuff, is just cheap thin flimsy **** usually...