Hi Guys,
I might be on to something with the wing thing...I bought a pair of MK3 escort wings and cut the arch off - If fits almost exactly in place of the S12 arch and is being welded up at present. I have taken some pics and will post them shortly. The good thing about this is that it gives a slightly wider front arch.
I am still looking for a car with a similar arch profile for the rear...any ideas?
As for Smith and Deacon avoid them as I bought fibreglass arches a couple of years ago for a MK1 RS2000 and the were nothing like the originals and didnt fit....?