There is a company called Eastern Metals that sells it pretty cheap. The only problem is that they sell to manufacturers only. Try contacting a local sign shop and see if they can order a sheet for you. It runs about 50.00 a sheet. Or you can do what I did, cut regular diamond plate, scruff it up a little and hit it with krylon. I've had mine for over 3 years and it hasn't chipped or scratched yet.
In my experience, the chrome treadplate is aluminum and black treadplate is steel..you can paint the steel treadplate any color you want. it is a lot cheaper to buy it steel in no color at all really and then paint it black. a 4x8 sheet of aluminum is about 100 dollars where I get my supplies. just look up any metal stores..Wheeler Metal (Arkansas) is where I get my stuff
you can get diamondplate at Maryland Metals in Hagerstown, Md. comes 4 x 8 sheet, 1/8 inch thick. You can cut it and bend it any way you want. I just diamond plated my Jeep, rear corners, tailgate, under the doors, on top of the front fenders for about $600 would have saved a bundle had I bought a sheet and cut it myself.
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