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@gbj_tester
There's more to stance width than Q-factor (the width across the pedal eyes). Ultra Torques are 145.5mm, but they're actually narrower at the axle than my 138mm Q-factor square taper cranks. Since your heel has to clear the axle, a narrow Q does you no good if you then have to shift your cleats inboard to provide heel clearance. Given that Pista cranks don't need to clear flared stays or chains heading off towards the dropout face like a road bike, a Campag UT Pista purpose built could easily be made with a Q of 140mm without changing the bearings or axle bosses from the road sets.