Posted by Will (in MI) on Friday, January 06, 2006 at 5:31PM :
In Reply to: I am using the 1.3125" and Hydroboost on the M ntxt posted by Paul (in NY) on Thursday, January 05, 2006 at 4:16PM :
Part #M82071 - 1-1/8” Dual Disc M/C
NAPA Item#: UP39052 or Item#: SS4739052
Sounds like a 1.125" non-step bore unit, now to see if the 39017 is interchangeable.