hey stu your best bet would be to talk to a panel beater they would probably be able to get clips for you of some sort.

i know you can use self tapping srews on the arches and rivets on the front and back bits of the kits the only hard bits id say would be the side skirts.

i dont know if you can still get the fixing kit from ford i mite be able to check for you if you wanted as i work in a ford dealership but not much of the stuff for the xr2 is still available.