I have been given a Mantec 115-RAIDEF Raised Air Intake for my 63 plate Defender 110 Utility. Whilst the majority of it looks straightforward and a post by White90 shows some useful pictures, how do I get the pre-threaded bolt retainers into the wing with a rivet gun? I've never used one but surely they are way too big? Any help would be gratefully received from this Defender relative-newbie.