The hydro itself would bolt in no problem. However, you would have to remove the clutch completely and get the proper drive hub, and use the 123 driveshaft. You would also most likely need the dash tower from the 123 because it has the mounts and holes and everything for the hydro control lever. In theory that should be all, but I'm no expert on the 122 or 123.
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'70 107 with k301 engine swap
'71 106 with 38" deck
'70 147 R with factory replacement k321, 42" deck
'61 Original with 38" timed deck
'63 70 "pinkie"
1863 with 54" deck
'46 Farmall H, '50 Farmall Cub
105 x2 (parts)
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