For esoteric measurements, obtain a set of blueprints. No blueprints? Go to Wright-Patterson or RAF Museum Cosford and take them yourself. There is no substitute for looking at an original.
These (below) might contain blueprints for mounts and misc. parts:
http://www.ebay.com/itm/140844110282...84.m1423.l2649
http://www.ebay.com/itm/130761410628...84.m1423.l2649
Good luck!
Bronc