I don't think that there's a lot of places out there that still carries that bracket. I'd recommend that you get it directly from us. Just submit an RMA request and ask for a bracket replacement kit. Submit a ticket here, Corsair.force.com. If you run into issues getting one, post your ticket # here and I'll personally push your request through.
Edit: Just a heads up, our support guys will be on holiday break till Monday next week, including me, so if I don't reply back, it doesn't mean that I forgot about you