It is one thing if somebody is paying you to work on a machine, another if you are tinkering on an old tractor on your own time or as a hobby. In that case, time spent identifying and obtaining a standard part is just as good as time spent sniffing a paint can. The ultimate conclusion of the "time is money" argument is that we should scrap the old tractors, buy a new one then hire somebody to drive it. By the way, my nearest CaseIH dealer is at best about a 2 hour round trip, so running over there for an o-ring isn't likely to be the quickest way to get one.
Back to the original question, o-rings are commonly made of EPDM, Buna-N (nitrile), Viton and silicone and a few other things. Each has advantages/disadvantages. If you google a couple of those materials (at the same time) you will probably find several comparison charts. Buna-N is the usual choice for hydraulics. I thought class 6 had to do with food grade and medical use, so unclear why it pertains to a hydraulic part in a tractor. Maybe there is some aspect to grade 6 I am unaware of.
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