Neil, I have a couple here. 1 looks as new. I'll see what I have.
Herb

Neil, I have 2 that I can find. 1 is new take out, tractor was never run. Another actually good used. You can have the used one for shipping to your 10-20.
PM me.

Thanks, Herb.

Neil,
Glad to hear you had success breaking that clutch loose. One thing that my Brother-in-law did was that he always locked the clutch pedal in the down position any time he parked the tractor. That way he never had to worry about the clutch disk freezing to the flywheel.

Hi Neil, I put sintered bronze steering clutch plates in my D2 5U years ago, and about a year ago used that D2 to pull my 22 along flooded irrigation channels for about half a day, the 22 has nearly new track chains on her that were rusted solid when I dragged that tractor home, and I'd gotten the chains busted loose, but they were still super tight, so I thought skull dragging the tractor through water 15" deep would be the perfect remedy.

It worked, but I'd forgotten that I had the drain plugs out of the steering clutch housings in the D2, so obviously some water had gotten into them while I dragged the 22, the next time I went to drive the D2 out of the shed the little devil refused to turn either left or right till I really jammed on the steering brakes hard, needless to say I was really surprised that my fancy new sintered bronze plates had seized up while the tractor sat, even though all the water had drained out immediately I finished that little job with her!

In case you are wondering, yes, I did check the gearbox and final drive oil in the D2, that tractor has all new Cat seals and bearings from one side of the backend to the other.

Sintered plates are brilliant, but not the be all and end all for preventing sticking issues where moisture is present. That D2 5U also decided to stick the main clutch plate on me too a couple of years ago, I'd driven it a few months previously, the next time I couldn't get it into any gear to drive it out the shed, I tried unsticking the friction plate through the inspection hole with a pry bar and diesel but that didn't work, and ended up pulling the clutch.

I suspect that mud dauber wasps had plugged the small bellhousing drain hole, allowing oil to slowly build up in the clutch housing over 7 or 8 years, and that oil actually kind of glued the main clutch plates together as the tractor sat for months, a similar problem it sounds, to your 22.
All the best
Mike