Search found 1592 matches
I have used wood screws, of course you have to drill the right diameter hole first. And if you have enough thickness of GRP. Or can use a nut a the end if using M5 bolts.
I don't know for sure but on aluminium I guess that the counterplate sits under the body panel. On GRP it makes no sense and it should sit like in your drawing, because the GRP is much thicker.