With the Chimera Quick Release Speed Ring Conversion, you can convert most of the older Chimera Speed Rings to a Quick Release Ring by fitting a new Quick Release Outer Ring onto your existing inner insert. Measure your inner insert diameter. Most older Speed Rings with eight bolts holding the insert are compatible with this conversion.
Great idea for a product and I'm sure it would work with the right softbox but I have some cheaper knock off softboxes that I use with a bowen mount and none of them worked with this product. The fabric didn't connect correctly so there were a lot of gaps where light leaked and also, something to keep in mind - the rods slip out of the softbox pockets quite easily so your soft box better have long pockets for the rods if you want this product to work.
This is an extremely high quality speed ring. It's incredibly solid, as is almost everything else I have from Chimera. The quick release feature is so convenient, both for putting a softbox up and for taking one down. I use this conversion ring with an IDC slipper kit to mount softboxes with my hot shoe flashes on pocket wizards. It makes a bullet proof setup with no stress whatsoever on the flash or pocket wizard.