[Lynn Eades]

The Aust. Box has an integral mount as part of the housing casting. The Brit. box has a separate bolt on mount. The Brit mount has 3 evenly spaced mounting holes, wheres as the Aust box mount has a gusset cast into it, because of which the center hole is offset.. Basically the Aust box could go in the same place with no middle bolt. The problem is that this is a weak area as the boxes tend to work loose at the three bolts anyhow. (the box tends to react to the wheel movement) There is probably some movement in the hull, which doesn't help (the riveted carriers generally have a self aligning bearing)
I'm not sure, but I think the columns areof different height.
The Aust bearing housing takes a metric bearing (6305?) which is easy to get and cheap, the English/ Canadian brg. is imperial, expensive to buy new, and hard to get. I am not sure about the column diameters where they fit into the bearing.
I do have a bellcrank (not flash) put aside for you.