Wrat I thought the same thing about the hyper shocks.
If you measure the outside of the hyper shock it is 16mm where as the kyosho shocks use a 16mm shock piston.
I have'nt done it yet but measure your shock piston and you will find it isnt 16mm unlike the kyoshos
One of the guys at the club has big bore shocks and looking at them they are physically fatter than mine, looks almost 18mm, anyway hope that helps