Cheers Alan

Just had a poke and the OSF one has pulled off with little effort

. The bracket looks like they were originally moulded into the rubber endcaps and, with a bit of thought, could be mechanically refitted to the bracket.
In my case, new brackets would need to be knocked up too as the rear one is broke and the front one that I just pulled off looks well rusted

.
Let me know how much I owe you for all 4, if you have 4 of course