110mm and 120mm widths are the most common for rear CB hubs. I'm not that well-acquainted with NEXUS hubs, and I'd hesitate to do this on any coaster-brake hub, but I have gone without lock nuts on a front hub or freewheel rear hub to make it fit in a super-narrow fork/frame. Of course, this means it's a PITA to get the adjustment right AND the axle tightened down.
Nexus hubs have indexing washers that keep the axle from rotating in the dropout - you MIGHT be able to shuffle things around and install these backwards from OUTSIDE the dropouts on a narrow frame, but check that out with somebody who's got more time in with these things before you buy one.
