Quote: "new front fiberglass fenders."
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I have helped install fiberglass fenders on other cars, not Porsche.
It ALWAYS comes down to how GOOD a reproduction is the 'copy' fender. My experience is ...not very!
You may have to 'slot/oval' the mounting holes to get close. Too large a gap with steel, you just weld on, hammer and grind to fit. With fiberglass, one has to build up the area with fiberglass and shape.
Prepare to learn NEW curse words.