They are not interchangeable with the Cat or other after market parts?
Seems to be plenty out there...
https://www.machinerytrader.com/parts/search?page=1&partnumber=cr4409&searchtype=starts-with
Our channel highlights machines from the earliest Holt and Best track-type tractors, equipment from the start of Caterpillar in 1925, up to units built in the mid-1960s.
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