Bearing size for sliding door on 1996 Toyota Townace

[SeaGlass]

Whilst here I thought I'd also ask the following question. I found the threads on repairing the sliding door (great info) but couldn't find any details for the bearing needed for the runner which goes onto the outside of the van, the one which would be on part number 68340-28010.

I think there was a mention of one of its dims being 0.666 and a comment on that probably saying something, but if anyone has the full dims for that bearing that would be amazing.

many thanks,