What head are those designed for? The step design looks like something for an open chamber cast iron head? I'm not sure why there is a step up and a dish on the same piston unless it was an attempt to get some quench with an open chamber head?
If you have a block, crank and rods for sale you might just sell that combo and let the buyer get their own pistons. Most people run TF heads these days so the stepped design isn't going to work.