Hey and welcome to NICO Club!
Um, for that particular part, I'd go to the local junk yard and pull it off on nearly any mid 90's Nissan brake booster shaft. Bring the nut with similar thread pattern for verification.
Or, contact the dealership. I looked at Courtesy Nissan parts and they don't offer that stuff anymore. I think it would be included with a brake booster, but I could be mistaken. I don't see a unique part number for it. We do have a new member here that works at a dealership. I'll see if they'll take a look for you. Here's a diagram that makes me think you have to buy the whole booster:
https://www.nissanpartsdeal.com/parts/n ... 70f20.html
Curious, what happened to yours? Bent all out of shape? Stripped? Lost in a core deposit for a replacement brake booster or what?
