Saw this on Ebay the other day.. http://www.ebay.com.au/itm/1990-199..._Parts_Accessories&hash=item35c789c097&_uhb=1
I once found a place that claimed to have bought the original factory mould for making Z32 carpet and could make them to order. Can't find the link anymore but, it was a while ago.
Yeah wouldn't have a clue about the quality, they might be able to send a sample, and as they are custom maybe they could make RHD? Luckily mine is still in good condition, its just everything else that isnt haha
Also check out these guys. Dont know if they do RHD though. http://www.stockinteriors.com/AutoCarpet.asp?Itemid=8263&MakeId=20&ModelId=317 Is there much difference between LHD and RHD carpet?