1964-72 Pontiac GTO Black Out POL or Wilwood Hydropower Power Brake Conversion Disc Brake Conversions 1955-59 Chevy GMC 2nd Series 3100 3200 3600 3800 Truck 00 for stock ride height

00 for stock ride height springs

Does not include outer metal sheel

they have locating holes to help maintain proper rear axle positioning

00" 1960 -1972 Chevy and GMC Truck Collapsed length = 10

1964-72 Pontiac GTO Black Out POL or Wilwood Hydropower Power Brake Conversion Disc Brake Conversions 1955-59 Chevy GMC 2nd Series 3100 3200 3600 3800 Truck 00 for stock ride heightOur Hydropower hydraulic brake assist power booster fits 1964 72 Pontiac GTO, Lemans, Tempest and generates up to 1800psi of line pressure to the brake calipers. It is fitted with a POL or Wilwood master cylinder and a Black Out adjustable proportioning valve. This kit is powered by hydraulic line pressure from the power steering pump. Firewall and valve cover clearance is equivalent to a 7" diameter vacuum booster. The firewall brackets are correct