I might have a piece of that, I'll get down the shed and have a dig, I'll come back to you soon (if I don't come back in 24hrs send in the search party please - if you saw my shed you'd understand)
George
P/S failing me finding anything you should have a look round scrap yards, failing that don't forget these cars are still very popular in Europe so try the European eBay sites, especially France and Italy.