The slots on the rear bodywork, the side scoop on the left rear and the batman-shaped exhaust to the front rad all look the same to me both in the WIX configuration and the earlier, light blue format pictured earlier in the thread. Can't really agree that it looks like an M8 body at all.
But anyway, we were lucky to have those two ripping round duking it out pretty competitively for our entertainment, with earlier the Stanton and then the T70 in the mix in Jim Boyd's hands. Used to love standing down the end of the back straight, hair-raising stuff...