These 1963-66 Chevy and GMC truck disc brake conversion front brake lines are designed to work with our manual master cylinder & prop valve kit or our Power brake booster kits, making your installation easy.Will not work with Wilwood master cylinders or proportioning valves.Available as OEM material or Stainless Steel. Due to shipping and packaging these kits may need slight modifications when installing.Will not work with Wilwood master cylinders or proportioning valves.