Hi Greg,
If you measure the center of the dropout to the center of the brake
hole you should get some thing close to 330 to336 mm, that's a rough
estimate.
God bless,
Anthony Mezzatesta
Mezzatesta Custom Cycles
909 Berkley Manor Dr.
Cranberry Twp, Pa 16066
724 498 4191
http://www.mezzatestacustomcycles.com