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@gbj_tester
If you measured 124mm, they are probably supposed to be 126mm, in which case a 'standard' 6-speed or 'Ultra' 7-speed, but there's no reason why you shouldn't use a 5-speed if that's what you have laying around. If you're feeling fancy, you can re-space a 6-speed hub to take a 5-speed freewheel and end up with an almost dish-less wheel. The Ultra 7 is actually slightly wider overall than a 6, and some frames have chain clearance issues in top gear if the seat stay tube extends close to the axle centre of the dropout.