When I bought my tractor, the price included a spare set of every filter that it needed. I always keep lynch pins, spare 3PH pins, spare grease cartridges, and even a spare grease gun, several gallons of the correct motor oil and plenty of diesel fuel, spare fuel filter for my fuel pump and lots of bolts of various sizes although it seems I never have the one I need even with 3 bolt tray bins full. A tool for putting liquid ballast in your tires might be a necessity, it was for me.
The one filter that I didn't get was for my cabs filtration. After 5 years of use, I finally decided to clean them and they were still clear and clean. I don't suspect that I will ever need to change them out in my lifetime.