Rickenbacker 4003 is 17.5 mm (0.689 inches) at the bridge.
Hipshot makes an aftermarket 4 string bridge with 16.67 mm (.656 in) spacing: http://www.hipshotproducts.com/files/all/4stgastyle.pdf
Kahler and Schaller also reputedly make adjustable-width bridges.
Fender Performers were reputed to have very narrow spacing though they are out of production now and I can't find documentation of any measurements or specs. http://en.wikipedia.org/wiki/Fender_Performer_Bass
I dug this info up because I also like tight string spacing, but a few minutes with Google and TalkBass search will give you a lot of information.