to be honest, I see no use for such bushes and complicity for a pedal box.....
I had built my own floor mounted pedals and box and used no bushes at all. Only used a steel bar with 12.5mm diameter hole through welded to the pedals and a 12mm dia shaft steel running through pedal's "bush" (sleeve) and box with nylon spacers between pedals.
A small grease nipple is fitted to each pedal sleeve and they work perfect and smoothly and will last a lifetime
