Carl,
Berco have mixed and matched the track gear on these machines. For instance the top rollers are Case 450 dozer/loader, track chains were made originally for Fiat 40 then later used on the MF200 dozer/loader, the bottom rollers are off a Fiat Allis and I have never been able to find out what machine the idlers came off. Common to all of this is the weight of the original machines about 4 tons, C140 7.5 tons and that the fore mentioned machines have been out of production for over 30 years.
I am considering going the Cat way and fitting D3 track parts through out