I am replacing the hydrovac on my 1966 GMC 5500 truck and want to change the hydraulic brake line hoses while I am at it. However, I haven't come up with the part numbers and am hoping someone here might be able to help. I have a Maintenance Manual that covers most parts, but refers to another manual for these brake line parts. My truck has the usual two hoses in front and one in the back. The steel lines they connect to look like about 3/16 inch. The Raybestos catalog shows front hoses that might work, but calls for two in the back that I know are too short. Bendix does't list any that I can find. And the local Napa store tells me that their computerized system only goes back to 1970. Any part numbers that I might be able to cross-reference would be greatly appreciated by me and my wallet. I know I can use the old hoses as patterns for making new ones, but I also know from experience that this can be much more expensive.

JRMunn