Upload & Sell: Off
Check the diameter of the insert in your existing chimera ring. I know from experience that the linked SP Studio insert is smaller than most (5.5" diameter or so), and does not work in many of my speedrings.
Kacey enterprises now has some flat 6" inserts that allow the flash head to be positioned further into the modifier, and give more even coverage. I don't believe they are on his site yet, so you'd need to email him.
Edit: I understand the Kacey inserts may not fit Chimera rings either.