It will be, but IMO the difference is negligible. The caliper slides anyway, I seriously doubt you'd run out of travel there. The only other thing is whether there are chanfers or bevels that won't play nice, but that's easy enough to check.
Agreed & my main concern. Figured, If there were 'shims' readily available, it's an easy was to eliminate a possible issue that may or may not exist. I worked w/Tobin on the C10 big brake kit modifying & testing various spindles to make sure things worked as intended. I'll e-mail him just to see what he has/thinks.