Okay.. well I just received the original 561 bag I purchased on eBay. To my absolute delight the bag was better than I though it was. No fading, tears or frays. The "Kirby" logo was bright with no fading at all. It looks like it came straight from 1961. I will update with pics soon.
Also, I am trying to locate a few more parts.. like an original cord. Anyone have one I can buy?