Dura Ace 7600 High Flange Hubs

Not so,
Low-flange DA hubs are NJS but they must be 36h. I have one up front of one of my bikes.
Madison used to have a problem with not being able to get high-flange fronts, don't know whether this is still the case. They could get h-f flip-flop rears though.

I bought a high-flange set for around 120 from Japan off Ebay last year.

Fair enough, i didn't look at what drillings Madison had available in the low flange but did notice that the part number for the high flange rear flip flop rear that i bought had NJS in it but the low flange rear (didnt look at spoke count and/or flip flopness) did not, possibly was 32 hole.

Hope there's not a problem getting high flange fronts coz as soon as iv worked off my rear wheel i was planning on building a matching one for the front.