Belt Buckle Blank For Stone Mounting Where Can I Find A Blank Metal Belt Buckle (actual Buckle With A Peg) That Is All Black?

Where can I find a blank metal belt buckle (actual buckle with a peg) that is all black? - belt buckle blank for stone mounting

I can only find belt buckles, plain, white metal, like copper, nickel, etc. I am looking for a flat rectangle, if possible.