One of the guys on this forum had some laser cut out of Chrome Moly a few years ago. He sold them through the classified section here. I have no idea how many he had to purchase, but they are nice and work fine.
I believe thats all the Triumph ones are made of, just cadmium plated to stop the rust.I suppose chrome moly is the right material, tho' I suspect it's plain steel I'm being offered...