I am using Goodmark fenders on my car. I am not overly impressed with them. The drivers side seems to be better than the passenger side but there are problems with both.
1) Drivers side. with the fender and hood in place and a good gap at the front and rear (~paint stick width) the gap at the middle of the hood is over 2 paint sticks wide.
2) Passenger side: The fender is 1/4" longer than the hood or driver side. Measuring from the front to the rear along the hood, the driver side is 64-1/4". The passenger side is 64-1/2". I have deterimined the extra length is the end up next to the windhield. This is a royal pain to fix.
3) both sides: From the front going rearward there is a body line that meets up with the hood (about 6 inches from the front) this line is not near as crisp as the one on the factory hood. I am having the skim coat it with body filler and reshape the line.