Hi Mark,
I got hold of some 5mm thick rubber material which has a fabric reinforced centre from a supplier near Middlewich in Cheshire and cost about £8, Its much stronger than plain rubber. I have just fitter longer ones so you can have the old ones if you want them. They were fitted between the stays and wings with the standard domed caphead bolts and nuts so might need redrilling to suit.If you see Paul at LADS, I can give them to him to pass on or BM me your details if you want them.
Cheers
Bill