You could try a post in the equipment for sale/wanted often tm's change equipment and have items left over, I can remember 1 going for a silly price (£10-£50) 'cos it had been stuck in someone's garden for a couple of years, a coat of paint and it looked like new. You could also try your local fabricators, Glynn Waterworth could get them made up quite cheaply I seem to remember.
Best Regards
Dave