I bought a 2' piece of 6" pvc at Home Depot a while back. They did not have the fittings in but had some of the PVC up high in stock where nobody could see. I had to ask many people there and came across the right person, I still have a big piece left. You can also try a local plumbing supply store. I found some places that carried 7" fittings which were really thick but only about 8-9" long at most. Found these parts around town near me when I stumbled across an old custom band pass box I put to use for several weeks...