You also need to make sure that you need to print this part in ABS or in PETG filament. Regular PLA filament can't resistance the heat in are cars and will warp.
I was going to update my mount by adding more holes on it to accept more mounting solutions. I think your cradle should work. The AMPs bracket w/the 17mm ball I used to attach my phone with was off a proclip on my last car. However, if you can measure the distance between the holes to double...
I didn't like any of the mounts on the market. So, I decided to 3D print one. It's a simple over the vent style mount. I added holes to the print, so I can attached the AMPs bracket that on my previous proclip. I also, printed a dock for my phone while I was at it lol. The phone dock has the USB...