Sony D21: These are the MID codes of the Sony +1x-16x. This MID code is on both Japanese and Taiwanese spindles. Pretty Decent.They don't scan as well as the Yuden000-T02 8x speed fuji and sony.
Yuden000-T03 are just now showing up in some of the Japanese spindles of sony +1x-16x. Hopefully fuji follows suit with using Yuden000-T03.
The white/hexagon spacer theory works very well with sony. I'm not sure about fuji. Fuji are a lot harder to come by for me in my area.