Make your own rear fenders Ewan, i made some for a Trojan I restored ( thread on here somewhere) I'll dig the photos out for you and load them when my internet has been repaired, its easy and cheap.
you need a spare wheel well from a scrap car ( boot floor ) i used a vauxhall vectra , i can make you a cardboard template from the rowcrop that has the rear fender kit on, just mark them out and cut them to size