I don't think it is a McCormick. The plates are unique. I found this on Goolge lens, but not much help.
Try posting on
https://forums.yesterdaystractors.com/
That's like saying you have a 2" trailer hitch, and you need to buy a truck to fit that.
How many acres?
Wooded or open?
Hilly or flat?
What tasks wil you be doing with a tractor?
You list your current tractor as an International. What model?
This info will help inform this journey.
This saw is so light and cuts so well, that it is what I reach for most of the time. I've had enough occasion to use it now, that I've developed the "touch" for the handling and performance. Like I said, it makes my other saws seem bulky.
I think the 2511's are a magnitude of size smaller, and a...
Someday all CUTs will have transmissions this good (i-HMT). The power of a shuttle, the convenience of a hydro. Plus, it can be accessed without splitting the tractor!