DanBell If you want to run an 8/9/10 speed wheel, you can use a 7 speed cassette. Just add the correct spacer. "
7-speed cassettes fit fine on 8- and 9-speed (and most 10-speed) hubs if you put a 4.5 mm spacer onto the body before the cassette." ~Sheldon Brown
More info from Sheldon here:
https://www.sheldonbrown.com/k7-7.shtml#stay