Just go by the valve-stem diameter. Umbrella seals are universal fit and go by size-ranges. You can easily look them up down at NAPA in the parts book by size instead of application. They only cost around 20 - 90 cents each and stretch quite a bit. Main this is the OD has to fit inside the springs. Just a few sizes will fit almost every tractor made (within reason). These umbrella seals go up and down with the valves and act as "umbrellas" to keep oil from running down the valve guides.
I haven't bought any new, across the counter, in years. That because I used to do a lot of head, and engine rebuilding at a Deere dealerhip, and have buckets full of seals from over the years. Mostly leftovers from engine kits, or certain jobs.
If you want stationary positive-type seals, things are much different and they usually aren't worth the bother. They go by the exact size of the valve-stem and also - the tops of the valve-guides have to be machined for them to fit on. they clamp tight to the top of each valve guide and the valve moves back and forth through them. They are cheap, but won't fit most tractors without machining - unless the tractor came with them new. Now adays, it's all that is used in new engines of most makes.
SEP MV1796 umbrella seals at NAPA are 19 cents each and have a .315" stem-hole. So they'll fit many that are slightly larger diameter.
SEP MV1921B umbrella seals at NAPA are 99 cents each and have a bigger stem-hole at .337"
One of those is likely to work fine, but I don't know off hand what diameter your valves are.
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