OK, this thred has TOTALLY confussled me.
I dont have the foam, i also removed the rear crash bar whist it was off to save weight. (just a hint
)
Matsu, with regards to your fittings, do you mean the upper part or the exhaust trim has no fixings??
if its the exhaust trim (spoiler) then any decent body shop would easily be able to bond it on for a tenner, (or send it me and il do it free)
If its the upper bit that has no fixings so you cant actually attatch it to your car then still, im sure a body shop could easily attatch it.
I got mine off ebay, cant remember how much it was but it was damaged so i fixed it and put it on, takes about 15 mins to take the rear bumper off and put the R on i think its about 2 screws on the inner rear arches and it pulls right off.
HTH