Upload & Sell: Off
Those tabs look pretty wide. I had problems with some 3rd party adapters fitting on my bxri. Photodiox for example, I had to dremel the tabs down.
Chimera claims SR and other adapters as a core competence: that includes a slew of hardware for attaching their boxes to big-brand hot lights. The Profoto insert for their QR/SR is indistinguishable from OEM. Given the price, it probably is OEM.