What Ben and I are talking about are basicaly the same thing. With mine, I take a brand new black cloth bag and I put it onto a heritage 1 or 2 emptor with fill tube. To change the bag you pull off the clamp that holds the top of the bag together and slide the cloth bag down away from the paper bag and fill tube. What I think Ben is talking about is just a heritahe 2 or legend 2 bag with emptor. They both work, but in my opinion, the legend 2 or heritage 2 bags dont match the kirby that well. As for price, a new emptor costs 20 bucks, and the cloth black bag costs 35. I can add a kirby logo onto the black bag for an extra 30, but it takes a long time, is a pain in the butt to do, and costs a lot.
As for the tan trim, I have new red and black trim for the 519. I also have the original red belt lifter and a new black belt lifter. I also have a few original bags and cords. So if you ever want your kirby to look totally original, I have all the parts needed to do it.
Hope all this helps
-Evan