Yeah they kinda were mass produced. Not so much anymore. It's getting really tough to find one. That's why I was looking at getting one made. I could probably do it myself, but I figured I'd let someone with a mill do it. They're around $100 or so "IF" I can find one. If not, oh well.
Also, the block of aluminum is the correct width and size (the triangle looking shape). I just need the hole cut in the middle and the holes drilled. If that helps.