Think the sizes on my 86 are 3/16, 1/4 and 3/8, 3/16 being used for carb to plastic tubes,1/4 being to steel tube(i.e,the heat riser,and the vacuum fittings in the manifold),and 3/8 for the pcv,and fuel. I usually get 6-8 feet of each to have laying around. Sometimes best to take a chunk of old...