Cub Cadet 123,
The part you need to weld to your modified lift arm (rock shaft) is NLA. No Longer Available. However you can find the rock shaft with that part already welded on it from one or more of the sponsors listed here. Matt G. just sold one a few weeks back. They are available. While you are checking on parts make sure you have the pump adjusting bracket. It is what allows you to put tension on the pump's belt. I hope this helps.
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