Master cylinder help

Also, depending on the year, the stock replacement MC listed may have a different bore for manual or power applications. The 15/16" one listed above is correct for power brakes. The one for manual would have a 1-1/32" bore. The bigger bore creates higher pedal resistance and shorter travel -- it may seem illogical that the power brake MC would have a smaller bore, but the reason is that the longer pushrod changes the mechanical advantage at the pedal. At any rate, the bore size doesn't affect interchangeability.