Well I'm no experet, proabably because I don't own the most comprehensive book by blah blah blaha, avalable at blah blah blah but if I had to guess I would say the 101jr really didn't replace anything at the time. They were made starting in the late 30's and ended in the early 40's. The massey harris 30 is proabably the closest replacement for it. They used the same blocks with the bigger bore of the four cyl flathead motors of the time offered in 20,21,22 101jr etc. As for the 101sr, it replaced the super, both six cyl. Motors but the supers were chrysler powered and seniors were continental powered. I'm not sure of a direct replacement but the 44-6 might be close because of the six cyl motor however I believe the regular four cyl. rowcrop is a better tractor. I'm not sure of options but my dad had a 101super on their farm but it was just a drawbar tractor. No bells and whistles like hydraulics. Weather or not that was standard or they could be ordered witth or without at the time I don't know. They sure were a good looking tractor though. So that's my guess to try and help you out until you buy your most comprehensive book by blah blah blah.....
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