A friend of mine just had one of those stainless steel sleeved, as it was cheaper than he could get a new unit for. He still runs several of those trucks, so knows who has parts and where to to get the best deal. This time it was cheaper to have them sleeved, although lately when he has a hydraulic brake or clutch cylinder fail he just sends it out for sleeving, then he won't have to deal with again it for a long time.
If you ever can't get new cylinders, or just want some to last forever, have the old ones stainless steel sleeved. DON'T mess with brass sleeves.
The guy to have stainless sleeve your cylinders is:
Mark "the machinist" Frappier
82 Mountianview St.
Agawam, MA 01001
413-789-4588, or 800-528-5235
You send him your bare, stripped, clean cylinders, and he sends them back with a perfect looking stainless insert.
You will still need to go to NAPA and get rebuild kits, or perhaps Jim Carter sells kits?
Grigg