The bearing plate and flywheel are bigger on a K301 aqs than the K301 in your 129. I've never tried it but the shroud from a K321 may fit. The exhaust also comes out at a different angle so modifications will have to be made for a muffler.
If you want to go through the trouble you could use all the parts from the bearing plate out, off of your K301.
I can't remember for sure but the pto end of the crank may also be a different length.
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