Yes they should. At least you have a 50/50 chance.
SOME 7-speed Aris freewheels are 6-speed with the smallest sprocket screwed into the next-smallest, which functions as lockring.
MOST are 7-speed with the smallest sprocket cog functioning as lockring.
8-speeds are ALWAYS 7-speed freewheels with the smallest sprocket screwed into its neighbour, which functions as lockring.
Telling the difference between the 2 is quite tricky.
If needs be, I have a NOS spare 8-speed freewheel with no sprockets.
Completed: 94 Stumpjumper w. M733; ; 92 Dave Yates 731 ; 97 Parkpre Pro-Elite ; Pace RC200 F6 ; Pace RC300; 82 Gios Super Record ; 97-8 De Rosa Giro D´Italia; ; Banani SPX Track bike ; 89 Alan/Mavic Cross Bike ; 05 Focus Cross Team ; 90 Look MI-80 all-Mavic ; 12 Focus Izalco Team/custom build ; 11 Focus Thunder Custom build
Projects : , Brouwer all-Mavic
Stripped : Pace RC303
Gone : GT Karakoram
Stayed in the family: Kuota Kharma, 04 Stumpjumper FSR
Ceased to be : Dynatech MT3, killed by corroded seatstays.