Your local JD dealer or a good business that performs hyd cyl repairs.
AM118390 Seal Kit - KIT, SEAL (1-3/4" CYL.) ADD 64.33 USD
AM118391 Seal Kit - SEAL KIT (1-1/2" CYL.) ADD 49.99 USD
Check out shops that deal with hydraulics. It's very probable they would be able to help. Can not verify but JD hydraulic cylinders may be pretty standard items.
I used Motion Industries for these parts in the past. I would also use JD since they have the kits ready to go. Might be a little more money but less than the cost of rounding up the parts somewhere else.
Edit to add that when I did use Motion Industries it was when I worked for a large hydraulics company on Peters road in Harvey. Lots of choices in NOLA, I am a native.