What size piston in a Husky 455 Rancher?

[Coldfront]

I don't see a piston listed at Bailey's for a 2004 Husky 455 Rancher. Does anyone know what size piston I need? The piston mic's out to 1.802 to about 1.806 inch, I converted 1.806" to mm comes out to 45.872 mm.
Actually it says its a 55 Rancher