8 DUAL STREET TYPE POWER BRAKE BOOSTER. Our 8 Dual Diaphragm BlackPower Brake Booster is 100% brand new, not rebuilt like other models!Dual Diaphragm boosters offers upto 19% better stopping power over single diaphragm booster. This booster is universal, bolting up to Holden HQ thru HZ models and other vehicles with no problem. This is a safe and inexpensive way to upgrade the safety of your ride. The measurments are 130mm long and 195mm diametre. Additional benefits are, if you use the tall type valve covers or the big block chevy engine conversion the valve covers can touch the factory booster and damage those pretty new valve covers, using this booster will prevent this happening. The item "Holden HQ HJ HX HZ Black Power Brake Booster 8inch Gold" is in sale since Monday, September 19, 2016. This item is in the category "Vehicle Parts & Accessories\Car & Truck Parts\Performance Parts\Other". The seller is "gt01gt" and is located in sydney, New South Wales. This item can be shipped worldwide.