1968 plymouth valiant 100 a/c vacuum diagram (factory installed) with 225 slant 6

Use this one for cars with 5/8" heater hose, or this one for cars with 1/2" heater hose. Most of the '70-'72 cars have 1/2" on the inlet side of the heater; pre-'70 and post-'72 cars mostly have 5/8".