Original RHD V8 floor matts are difficult to source. I recently ordered a set from a supplier only to find they are standard ZT pattern and do not fit. So to solve the problem I obtained a set of beige OE matts from SMC and sent them to the supplier to make a pattern from. They then made me a set in dark grey which would suit my car. The company in question is called EZY Traders, Unit 1 Synergy Business Park, Essex St. Bradford, BD4 7PG.
They can now supply sets in several colours and basic, deluxe and deep pile materials from £19.95. They have a raised heel pads rather than rubber of the OE version and come without the fixing holes. You should be able to find them on E-Bay. I also have a picture of my matts alongside the original beige OE versions which I can e-mail to anyone if they would like to PM me. I also now have the beige OE matts going cheap if anyone is interested.