The 106,107 had a 10hp. Kohler K241 motor in it from the factory. I am not sure if the crank centerline or offset will be the same, nor the drive hub that attaches to the flywheel will fit up the same. The drive hub has a dowel pin in it that goes into the flywheel.I can look up the rest of the parts this evening that goes to that set up and let you know the rest of the parts.On the other hand you can use a 12,14,16, and 18hp single Kohler K series motor in that tractor. The 10hp. motor has a different oil pan for that tractor in comparison to the 12-18. other than that all the large block K series singles will just bolt in.