Stop in for a cup of coffee

I have a question for all of you fart smellers.....I mean smart fellers. I am turning a van into a camper so I can drive to the North upon retirement. I have a leak in the AC thats not the problem my problem is alot of the metal lines have rust all over them. Is there a place I can order replacements?
Ooooo Unless it's only a few years old, probably not