Here's what's on the Nissan Comp Blueprints.
I made a set of these out of delrin about 5 years ago. They're still in.
The ID shown is .470" or 11.938mm.
Hope this helps.

ps- I went to a local platics place and bought a piece of

Hey everyone. Here's the scoop on my bushing situation. I got in touch with MADDAT.COM and they knew exactly what I was looking for. They had it in stock from Super Pro (yes they're polyurethane), sent them right out, and I received them 8 days later here in Arizona, USA. Tamra from the sales department was easy to work with and very helpful. I would recommend these guys to anyone who needs parts for their 1200. I also received a couple of MAD DAT and Super Pro stickers for my rear window. I can hear it now... MAD DAT? What the heck is a DAT? ... and why is there a giant mouse on a bushing sticker?

great info