I was just looking at a nice set of tracks for a 420-430-440 in really nice shape. 10" pads with cleats (dozer style). I was searching the tractor salvage yard near me in central New York for tracks for my 1010 crawler. The 420 tracks will fit my 1010 but I held out for some 440 or 1010 tracks with four-bolt pads.
These tracks are already off the crawler and MacFadden want's $1000 for the pair. 36 link so off a five roller crawler. Sharon Springs, New York. I finally found a good set of 1010 tracks elsewhere and they cost me $1500.