another Piston ID question

I guess they are in fact " HY-DUTY" pistons, inc. based in CA a while ago, belly up and I need one. I guess Im F'd. I read the compression height as 1.78 and a dome height of .170 so its shorter than a KB399 but has a taller dome. Any 3.9 V6 guys need some pop ups? Cheap and you get an extra...;-)