Welcome,Mr. Donald...
A 14 hp will not "fit" on a 126 without modifications. The flywheel on a 14 hp is larger than the original 12 hp and will not fit between the frame rails.
A 14 will "fit" on 108. The 14 hp in question,, does it have a starter/generator or a gear starter ? If it is a gear starter, a few changes might be in order, mostly concerning wiring and the pto clutch.
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Cub Cadet 100 "Super" (red) show tractor
Cub Cadet 100 show tractor.
Cub Cadet 100 worker
Cub Cadet 106 refurbished/modified (red/white)
Cub Cadet 128 "refurbished"
Cub Cadet 1450 my dedicated mowing tractor
Tractors awaiting refurbishment:100 with fenders,128,73 with creeper and fenders,106,122,147,126 with creeper.
100 w/pan seat and 3 point hitch
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