While the "Nintendo Switch Joy-Con Wheel Pro" is the best looking design and ergonomic to steer, the L/R button are very hard to reach as many have found.  It is simply not usable for kids, so I made paddle buttons for it.  

The “Nintendo Switch Joy-Con Wheel Pro” does not allow remix, so I cannot add it to the original model.  This model has 2x M3 screw holes to attach to the steering wheel, and a large flat bottom that allows you to simply glue it on.

Printed with PLA with 20% infill.

Do not print with reduced first layer size (elephant foot compensation) or it won't stick.  Default Cura settings work well.