Joined: Jan 2010
Posts: 9,827
Likes: 1,806
From: Northern California
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
Look for a long 68mm JIS spindle and be sure to account for any offset. There are a lot of spindles made for "square-profile" (not lo-profile) cranks like the AT triple which will have similar dimensions.
A 127.5mm Shimano cartridge bb will be better in every way and will require no maintenance.
If you checked the chainring-to-chainstay clearance before disassembly then you'll know whether a shorter spindle length can be used to improve the chainline, assuming you don't have a preference for using the small-to-small sprocket combinations.