Need A833 advice

the mainshaft and extension are a matched set.
I suppose you could install a 307 bearinged M/S into the wider tail but the OD is a loose fit in the tail and you would be alerted right away as to the mistake, when the M/S started flopping around in there. But that still offers no insight as to the climbing brass.
The last wide-bearing I bought cost me over $135C and was special-ordered, taking a few weeks to arrive. And that was back in the mid 2000s..