It took a while, but I got it done!
I tried sourcing individual seals locally but no one could help me. Steve at Hyd Parts Supply got me the rebuild kit. Thank you very much

Although the leather cup seals for the pump had the wrong ID (too small), I made them work.
Rebuilt the pump and lifting cylinder, cleaned out and lubricated the castor wheel swivel bearings. Cleaned it up, sanded it down, gave it a few coats of Rustoleum paint and two coats of clear. Although the paint may not match the original, I think it came out looking not too bad and is now a useable jack! ....and it held a vehicle up over night without any internal or external leakage!
Rebuild successful

I wish there would have been a decal kit available with the seal kit but apparently not.