I went back and added an image to my post, but looks like it stuck it in the middle of the text. You should be able to type the web address at the bottom of the image into your computer and access the 410 parts manual for more of the transmission parts breakdown. if you can look at a 320 factory parts manual, you probably will only find the column shift trany. The floor shift was used in the last year or so of production fo the 320 and also in the 410 sedan and the first half yar of the 520 pickup that replaced the 320. If you're gonna be doing serious wrenching around on these relics, I'd advise accessing the parts and service manuals for all the old Datsuns on the NICO site. here's a link to the manuals page. Just do the dropdown for the 320 and you can open the service and parts manuals. To find the floor shift trans as I stated before, you'll probably need to look in the 410 sedan or 520 pickup tab. I'd suggest that you run a 'Want To Buy' ad in the classifieds page of this forum for the shifter parts that you need. You are a bit lucky being in the Pacific NW where a lot of the old Datsun stuff has survived better than the rest of the country.
https://www.nicoclub.com/datsun-service-manuals