Took a trip to bunnings to make a super special tool.
Bought some 150mm PVC pipe.
So the next step would have been to measure the clearance from the pump mating surface to the bearing surface you can see in the last pic.
However I'm now having one of those "might as well just do it while it's apart" moments. As long as I can get one to suit my converter that I've only recently bought, I think I'm going to go with a 1-piece input shaft instead of the two - even though my current inner shaft is 300M material. My current converter is already non lock-up, so going to single shaft will make no difference except that it will be a lot stronger.
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