Dakota,
MF bought the Italian firm Landini in 1960. They had a history of both wheel and crawler tractor production. The purchase gave MF access to their crawler tractors.
Here is a pic of my MF 134C crawler tractor. It has a three cylinder Perkins diesel engine more or less the same as in the MF 35/135 tractors.
The crawlers were sold throughout Europe, Africa and elswehere but never as far as I am aware in N America. They had a good reputation.
One of these enthusiast built “”MH”” crawlers was also sold in Gerald and Charlotte Fank’s sale a few years ago in Cosmos, Minnesota. I think, but am not absolutely sure, that they were all based on Cletrac chassis etc.
John