William, Have you contacted us for a return? Our warranty team would be able to get you the exact mount as well, we just do not sell them on our website, just the one you ordered as it is universal. I will send you the info for warranty as they handle all returns as well. You can contact our warranty team here. They can assist you with any of your lights needs, including parts and returns and get you taken care of.
https://www.fenixlighting.com/support/warranty-repairs/ or call them at 888 775 9996 EXT 1
Have a awesome day!