Replacing pigtails on'86 32' excella

One of my propane connections has a leak so I'm going to replace both. Problem finding correct hose. The newer opd valves are installed and the hoses have been replaced at least once. They have the pol connectors and are about 36" long. I'm finding shorter(15-18 inch) & 60 inch ones which are too long. I've owned trailer for 15 yr. Not sure what the shortest hose is that will work. I have 30# alum bottles.

Suggestions?



Thanks