Why don't you look for a tractor to fit your cab? Last summer I took a cozy cab off a large frame bolins and adapted it to fit a 149. I had to extend the bottom of the cab 5" down to the fenders to give me enough head room. Needless to say a lot of work but very well worth it. Anything can be made to fit anything. It just would be alot quicker and easier to find the right tractor like a 149 w/hydraulic lift to fit your cab and by the way, whats wrong with having another Cub around?????????
