SA Hub Axle Lengths
 

I'm trying to build up a SA hub for use in a winter bike, and I found this on Sheldon Brown's site: http://sheldonbrown.com/sturmey-archer_tech.html#length

I have seen both 5 3/4 and 6 1/4 axles, but I have never seen a 6 7/16 axle. I have an old Le Tour Luxe frame with 126 mm horizontal dropouts, but I don't want to cold set in case I rebuild it as a derailleur bike. Anyone seen this longer axle? Where can it be purchased? Will it work with older AWs?