Advice on BB Spec for 1992 Stumpjumper Comp

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Specialized Fan
I'm building up a 1992 Stumpjumper Comp, the Pink one, and was hoping someone might be kind enough to give me a steer on the BB spec before I have to study first principles at sheldonbrown.com.

I have an original 3*7 Shimano XT M730 crankset, with 46/36/24 110/74 bcd chainrings.

The frame BB Shell measures 73mm. Since I was advised that the previous BB extracted from this frame before I owned it was 68*122.5, I wanted to double check with anyone here who might know or advise what I should really go for.

Presumably (obviously?) I should be using a 73mm BB, but the prior info on the 68mm BB makes me question the 122.5 width advised too.

Any input or advice much appreciated.

Regards,

Andrew
 
Thanks!

For any future reference that shows the following for this combo -

Deore XT M730Triple122.5Square110/741990-1993
 

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