Tell you what PC7 you can actually drill and tap if needed and works well on the fiberglass.
Good hardware stores have it.
PC Products PC-7 Epoxy Adhesive Paste, Two-Part Heavy Duty, 1/2lb in Two Cans, Charcoal Gray 87770: Amazon.com: Industrial & Scientific
Wow that stuff looks pretty serious. Will need to find replacement studs that have the flat button like the ones that I damaged. Will take a look at "the groove" after work, thanks!