I have received a note from a friend who is rebuilding an older tractor and had a question on the above-captioned. Wayne asks: 

"...did you ever have the need to make a non-standard o-ring or do you know who might supply a kit to make them up?

I guess I could just buy large o-rings, cut them and then join them together."

Any suggestions or recommendations out there? Sources of unusually sized O-rings?? 

Thx,  JT

Thank-you so much John. I have forwarded your recommendation to my buddy; I will post the end results if he goes this route.  And I will keep you note for my own reference...   this isn´t really a usual inquiry, is it??  Cheers, JT

any decent hydraulic repair/supply place can do it for you. They need to know the diameter of the bore it goes in and the cross section diameter of the ring (or have the part with the groove it fits in)

they will take a length of O-ring material off a reel, square cut the ends to the correct length, and super glue the ends together. takes only a few minutes.