Have you still got the "old" lower wishbones JMD? It may be worth finding out how much they weigh for a comparison with "new" wishbones, so early car owners can confirm what standard they have fitted. I assume that there is no visible difference between the two standards other than material thickness? At least you should not have any future wishbone problems 🤞.
As a matter of interest, another early M3W owner (Jim Lloyd) recently had the same problem and got two new lower wishbones for £130 each from Rutters. It seems the price has been reduced as they are now considered to be "Heritage Parts", maybe worth questioning the price?
