Universal fit Vacuum Brake Booster
7″ Diameter Single Diaphragm is 3-4/4″ thick from Firewall mount surface to Master Cylinder mount surface
8″ Diameter Dual Diaphragm is 5-1/4″ thick from Firewall mount surface to Master Cylinder mount surface
4 Bolt Pattern to Firewall 3-3/8″ (86mm) centers
2 Bolt Pattern to Master Cylinder 3-3/8″ (86mm) center, suits Wilwood Tandem Series Masters
Back of the booster to the end of 3/8″UNF threaded Pudhrod is 4-1/8″ (105mm)

Check #91031520 for Pushrod extender and #91631949 for Clevis