Not Ranked
I'd go with the short shaft and retainer and forego the spacer. Disregard the following if you know it already:
Search and find the exploded diagram for the TKO 600. Pry the bearing retainer loose first and try and slide it off the shaft by itself. Then when you remove the shaft, be gentle so that all the small roller bearings (about 7mm in diameter) will hopefully remain stuck inside the long shaft and not fall into the transmission. These will have to be moved over to the new shaft. Use some sticky grease to hold them in place while you install the new shaft. You will also need something called anaerobic sealant to seal the bearing retainer back onto the face of the housing. Traditional RTV NOT recommended. Very straight-forward.
Lastly, before installing the transmission, measure the distance from the transmission face out to the tip of the shaft versus the distance from the pilot bearing hole out to the outer face of your bell housing. This stuff doesn't always fit together and you don't want the shaft tip hitting the recess in the crank flange.
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