are there any suppliers still out there supplying these boots?
There’s a heavy equipment salvage in Ohio that can get them. I had trouble getting through the last time. It’s been a while. I need some more boots as well
If referring to the boots on the valve bank valves my Komatsu dealer gets them for my 1976 503L. Part number 59276A. Good luck!
Equipment Salvage in Cambridge Ohio. Unless something has changed, it's a subsidiary of Southeastern Equipment, so you might do an end run through a Southeastern branch.