Brake Hub help please! Sbp to bbp
I'm really skeptical at this point whether the Kelsey-Hayes spindle can support the 4.5" bolt pattern, just because of the distance between the caliper and the raised rotor hat.
However, despite my skepticism, here's a measurement of the inner and outer bearings on a standard B-body drum hub:
From outer edge to outer edge, 95mm:
Inner to inner, 59mm
Bearing width, 16.5mm:
Center-to-center distance should be somewhere around 75.5mm.
-Kurt