Walker Roll-A-Car Jack

[Old Iron Sides]

I'm having a problem with my Walker 2 ton roll-a-car hydraulic jack. The problem is two fold, pitting on the piston and corrosion within the walls of the cylinder bore. I believe this is causing scoring to the seals which leads to a hydraulic leak. I'd like to rebuild this cylinder and found it's a bit pricey to have the piston re-chromed and the cylinder welded up and ground down to repair the areas where corrosion is present. Does anyone have experience with a similar issue or, know where a good source of (non chinese) parts can be found? I believe the cylinder model number is a G874.

Thanks
Dan