Does anyone know where to find the latest shimano frame requirements manual. I found this one:

2009_Cover

but that only has info on the br-r550 canti brake. i purchased the br-cx50 brake. I need to know the required boss spacing and distance from axle. can i just assume the same dimensions as br-r550? the pdf states that i can mount the bosses as close as 65 mm but everything else i read recommends 80 mm. 80mm is too big for my ss spacing if i am going to mount the boss 283 mm from the axle. i can do a 75 mm boss spacing, which looks like it would be fine for the br-r550 but need to make sure it will work with the br-cx50.

Scott