Make your own, thats what I found works the best. I use mild steel from Brownells, in 3/8", 1/2", and 3/4". Also you can get 3/8" square stock for making the top quarter rib, you'll need to mill to fit, or use a hand grinder then file to final fit. I tried Toms ribs, and just couldn't get them to fit the way I wanted. I'm not saying there is anything wrong with them, they just weren't my cup of tea. Also, plain steel is cheap and blue's easily.

BS