Just wanted to highlight how I went about this. I have a new -10 kit and wanted to get this yaw damper mount installed during the tailcone process instead of doing a retrofit later.
As others have noted here, the "14 G3X YAW SERVO INSTALL KIT" installs just fine in the 10, and is substantially cheaper than the garmin equivalent. You will also need the garmin 115-01854-11 kit, which as of this writing SteinAir still has as a purchaseable part.
The main issue with installation of Van's bracket vs Garmin is the alignment of holes on the bulkhead. It's still an easily solved issue, however, one thing I didn't like is that all of the pieces of the battery box/elevator bellcrank/etc are removable with screws, but the yaw servo installation bracket is done with rivets meaning it will be permanently sticking up in the way when you try to enter the tailcone in the future. I decided now was the opportunity to try and also make it so you can remove the mount in the future should it be necessary.
The bracket looks like this:
The way it is intended to be installed is that the two smaller holes get riveted to the bulkhead, and the center hole is large enough to slip over the head of the existing rivet already in the bulkhead. Instead of that, I riveted a doubler plate to each of the feet using the existing rivet holes with the flush head on the fwd side that lays up against the bulkhead. When mounted it looked like this:
Now with this in place, drilling through the center hole in the bulkhead through the existing hole in the bracket and making a new hole in the doubler, we now have a place where a screw can go. This means you now install a nutplate on the bulkhead with the flush head on the rear side where the bracket sits.
Now when you go to install the bracket, it's completely installed with screws and can be removed later if needed.