1971 Demon fiberglass fender extensions

Ok, this info is all over the place and not at all on topic for the original request. Can we please focus on the studs that screw into the fiberglass fender extensions and if either of those links are correct for it
Sorry about that. I pulled a stud out of the replacement extensions (metal) and they use a machine thread. The studs that you pictured should work on the fiberglass extensions. Check the depth of the holes for the studs. If they are around 3/4" deep, go with the longer studs.