In Russia parts for Rolla cars are on sale is younger 1985. I tried to search in a network, but results have not received.
Paul, word "wreckers" mean - guys that assort the car on spare parts? (my poor language) :P
as variant - use wheel arches from VW Golf MK2
... or handmade fiberglass wings, maybe full aerokit. See later.
PS What do you think about Dremel tools? Anybody use same devices?