doing a search online it seems as if the metal side or asbestos side goes toward the header but mine is hard to tell which ones are being I am reusing them;copper. It appears that he possibly put them on right back when he did the current setup back in 05 but Im just making certain. Both sides darn near look the same so hard to tell also. Images below and I might as well take them things to work tommorow and clean them up.
solvent tank and wipe off or degreaser and wipe off I guess
solvent tank and wipe off or degreaser and wipe off I guess