hejlman, Just replaced the whole lift assembly on an '86, but I did discover there are hundreds of sizes out there. I couldn't get a prefect sized one, so I settled for a slightly larger one and fitted into the space. Reservoir capacity is 1.3 gal! Way more than needed.
Good luck in your search, perhaps Northern Tools or Grainger would be a starting point. A Hi Lo parts house wants $899 for the entire assy. $320 is what I paid.
2703 Tow Lite
Bonita Springs, Fl. &