I have .75" risers and Heli-bars together and they work great. I've had each seperate too and prefer them together, it's a big improvement in comfort for me.
https://www.hayabusa.org/forum/gen-...efinitive-answer-k8-genmar-riser-helibar.html
https://www.hayabusa.org/forum/gen-...efinitive-answer-k8-genmar-riser-helibar.html