Iain, since you have one or even pics, find a local fabricator and ask for a quote, in a masses, it's a simple CNC drawing and a break press to bend them. Or even on a not so busy day, get yourself a sheet of metal, a file, a grinder and a vice to hammer the fold over at the end. I could knock one of these up by hand in about 10 minutes if I had the equipment. To temper, heat up until red hot and drop into oil.