I run/own (family) a good size general machine and welding/ industrial supplies shop, and one of the many things we fix/sell is hydraulic cylinders, etc.
I'll have Vitons here tomorrow...but I did get impatient, used std Orings and drove it around the yard tonight. I'm stoked. Thanks! Kind of a life long dream come true.
EDIT :
I will need to replace some (most) of the injector lines and install the proper seals/boots where they attach to the HH, so I don't mind having to go back in and install the Vitons.Lots of rust and crud in the connections, almost didn't get the #1 HH nut broke loose from the tube without messing up the tube. Unscrewed it from the HH after I got the HH off. Dropped it in the vibrating solvent/ceramic media parts cleaner for 10 mins, tapped it against a vise with a hammer and blunt air chisel, heated it, soaked with oil...finally clamped the line in the vise and used a tube that fit over the line end to drive the nut upwards and break it loose.