here's what i did when i got mine and needed to do the seals for the lift cylinders, and pretty much have found everything i've needed for this old '98... go here
looks like you'll need the serial unless its a 'C'. kubota has all of the exploded views with the original part numbers for pretty much everything. assuming the cylinders are original and haven't been replaced, look for the kit in the parts list, then search for that number on amazon or messicks - or you can order from your local dealer if its something specific that needs an oem part - like hydraulic hard lines.