Many on rockauto list the bore size. Manual or power relates only to the MC and not related to what you have at the 4 wheels (drums or calipers), other than many people need a power boost for disk brakes and most all cars sold today have a booster. Personally, I don't fool with the old cast-iron MC's. You can buy a 2-4 bolt adapter plate on ebay ~$30 to allow using a newer 2-bolt aluminum MC. You can even buy as a kit w/ MC for ~$95 (Dr. Diff or such, forgot). Many here use an MC for a mid 80's Dodge truck (~15/16"D). I use one for a 95-99 Breeze w/ ABS (7/8"D). Best if 2 ports on driver's side w/ dbl-flare ports (not bubble-flare started ~2000). The smaller the bore, the easier the pedal effort, but more pedal travel.
