I must be getting old!
This is not a pair, it is two rear hubs.
1/ 140mm OLN, 36 hole, double threaded for block and disk break. $35
2/ 126mm OLN, 40 hole, single threaded for block, (Bicycle not tandem), $30
Regards
Martin Coopland, Scotland, http://www.BatesBicycles.com