I bought a aftermarket one for my D2 5U a month ago and it cost about $5 or $7, I can't remember if I bought it from Tilly's here in Australia, or Florin Tractor Parts in Sacramento. Try Florin, they are a bit closer to Yuma than Tilly's in Toowoomba, plus they have the new steering lever covers you obviously need for about $8 each, already primed!😆.
regards
Mike
MM, thanks for the tip. Florin got back with me today. No new, or used shift boots. They do have the packing for underneath....$7. Seems fair.
Unless someone has other sources for that boot, I'm putting a CV boot on my shopping list at the LAP stores.