oh right, I get ya matey. Erm dunno bout long/short arm thingy's. I guess it would prabaly adjust wheel base and not the track.
If you need an RDX, I have one for
£150, I will strip it down for ya and clean it, but set-up for GTCC is mint, as it was set-up by twice BRCA champion Gary Marsden . Thats with some spares, like belts e.t.c , and a tyrc racing bodyshell