They have 7" flighting and work great just the way they are. If you are tring to run when it is very tough you might want a pickup reel. If HHC pickup reel you should take a close look at the orbit drive. If I ever had problem with straw coming around the back of auger on a 700 or 800 I would quickly just add another stripper under auger. We secured a channel iron just ahead of most forward existing stripper on most all older headers with 4" flighting. This realy helps hold the straw down. Another thing I did with a lot of old headers with 4" flighting is extend the 4" flighting all the way to center of finger area. This prevents straw from standing in front of fingers and makes it very hungry. If you get a flex head I would look at 1_4" flat iron that holds the rear of feather sheets down. It acts as a dam and prevents good feeding when crop is short. We have removed hold down, fliped feather sheets, made new holes for pan head bolts, and secured without 1_4" flat iron. This helps a bunch to keep material flowing. Couple that up with air reel or HCC reel with orbit drive and you have it made. Hard to beat this auger head with 7" flighting for simplicity. I think we'll see the full fingers on head by fall and I hope they get rid of 1_4" flat iron dam on flex heads at the same time.