I need a little advice. I have a boot spoiler but there are no bolts coming from it. There are 4 holes.. the inside of it is hollow. Now i need to somehow attach some bolts to the spoiler within the 4 holes. Any advice on the best stuff to use for this. I.e fiberglass the bolts or glue etc. Any info much appreciated.. Failing that i will just have to go to the bodyshop.