Just seen on craigslist (Wausau), That there is 3 sets of ARPS half tracks for sale (in the Antigo area). If anyone collects with a 2 wheel drive tractor these are the sure ticket to make your tractor "almost" unsinkable. Don't let the ad scare you off if you don't have a tractor that the ad says what models they fit. I bought a pair and fit them on a 530 case, if you are even semi handy you can make them fit almost anything. Might have to take fenders off, use different style u-bolts depending on if back axle is round or square, and maybe take some links out to shorten track. The year i got them we said that these were the best investment we made in a long time for our syrup business. sorry, i don't know how to post the craigslist link.