Usually won't fit perfect, just like all fiberglass body parts. Expect to do some minor modifications to make it fit good. Actually, I remember someone on the board saying they had a horrible fit for the fenders a while ago, and that they'd rather have custom molded z3 vents into it. But custom molding will take a lot of labor and can still crack, so I dunno...probably cheaper to get the complete fender and hope it fits.
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2004 WRX - WR Blue Pearl 1997 Eclipse GS - Royal Sapphire Pearl
That message was by me. I still have the z3 inserts, cant mold them in because our fenders are too curvacious and the z3 sides are too flat with no give.