Awesome. I've read the whole topic and while I personally have little knowledge about O-rings and bearing interchangeability, I did get Nissan FAST working. But the needed part isn't either shown in Nissan FAST, but I learned that the O-ring itself has its dimensions printed.
Another friend of mine with five eggs had a defective distributor and took it apart and came with the following, Size: 12.45mm (Shaft) x 22mm (Bore) x 6mm (Width) which is are the same dimensions mentioned in the topic you posted.
Here are a view pics, since posts with pics are better then without