My 6 string has slightly narrower spacing than standard. Nut width is 2.0" instead of 2.2", and the strings are at 0.3242" (8.2 mm) center-to-center - just add 10% to get to standard.
The bridge spacing is of course different, as the standard is to have equal edge-to-edge distances between strings, given a specific set of string gauges. I have it at 0.59" (15 mm), but measured as center-to-center it goes from 16 mm between the C and G strings, to 18 mm between the B and E strings. If you do a custom order, you can get the spacing exactly to your liking (on a neck-through).