It rather depends what you are trying to fix.
At this point you probably have a press stud for the end flap for which a stainless self tapping screw should do as the glass fibre is pretty thick.
However your hole looks quite large and you may need a nut behind or you fill the hole and start again.
Maybe you have a tenax fastener which normally needs a nut fastening.
You should have a nylon slide on 'cotton reel' on the upper rail to take the hood stick over the door rather than the press stud in the photo.
Like this : lifted from SJ sports cars parts list!
- Cant rail spigot - sj sportscars
There's a combined view of both pieces in this thread.
viewtopic.php?f=36&t=37578&start=Other threads also help with hood