| String width ≠ string spacing.
String Spacing is the distance between the strings (well, between the grooves in the bridge). The String width, in the case presented on the bart website, is the spacing of all the strings, the distance between the B and G strings (on a standard B,E,A,D,G tuned, 5 String bass).
16mm spacing between two strings would be 64mm between the 5.
(also, 21/32" would be closer to 17mm, which would give you your 68mm min.)
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EB Musicman/Ibanez/Ampeg/Peavey/Marshall/Tech 21
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