Car Headrest Basketball Hoop

Designed this so my 2-year-old could shoot hoops while in his rear-facing car seat. Mounts through the headrest posts of our 2019 Toyota RAV4. I assume this is likely compatible with other Toyota vehicles, as well as a good deal of other makes and models.  

Mounting holes are 14mm (0.55") wide and 120mm (~4.75") apart, hoop is 140mm (~5.5") in diameter.   I have included the Fusion360 design archive if you wish to modify the design to fit your needs.