I have searched high and low for my thread, (F!@#$%^g Excuse Me) bc there were some good resources for parts suppliers from members. I ordered a cap from some outfit selling on Amazon which, as per the description will fit many Kubota models. The cap I received today was the correct internal diameter, about 2 inches, but as it turns out it is about 6 TPI instead of 5 TPI. None of the searches I have made on Amazon for either Kubota T 1560 nor Miller Bobcat 250 have yielded any results and I don't want to keep ordering parts that don't fit. It is apparently too much to expect for the thread pitch to be included in item descriptions. A problem only happens when, like a dummy, you order a part without matching model number.