I got one of the rims fitted with the FCII 265x75x16 , bolted it on checking each corner of the RR. Result is yes it fits, it will probably only foul on the plastic sill with steering locked under a dynamic load. Sitting static it misses by 5mm or so. We pushed the wheel up into each corner without any drama.

So there ya go its 5 off Dick Cepek FCII for the RR