Need help to find 1 piston

Hi,

I need some help. I need to find one piston. it's for a small block chevy engine....Thinks it's a Sealed Power.

number stamped on the piston is : 7055A 0.20

So I figure out .20 over. It's a dome piston.

If anybody have any idea where I can find one piston used..of if anybody have this on the shelf...

Will take it !!! :)

STephane