Hard to find part. I recently had to replace mine and found the best price on amazon. It was a ***** to change too because the bolts holding it all together were frozen into the frame. I had to use Dremel with cutting wheel to surgically cut the frame in 2 in order to separate it from the landing gear.
I also found an Inspire fastener pack for like $3 US that had those 3 center frame mount bolts so all was good.
It sucks because you have to do all that work and expense because a .50 cent plastic gear broke (at least in my case) in the servo.