fiberglass fenders aren’t the greatest way to go, they are very fragile and depending on quality will warp in extreme temp changes (i’ve seen this in person). They are also not totally ‘bolt on’ they will require adjustment as well to fit like any panels. So if you facture in everything the metal fenders aren’t that much more trouble and in the long run will look better and last you forever. Any body shop can do it, or someone on this board i’m sure has the skill to do it as well. S13.5’s looks really nice, i’d love to see one in person.