R/C Spare tyres / wheels for DF Mali Storm Fighter 2

My son has a DF Mali Storm Fighter 2 RC race car. It causes a lot of wear to the wheels and spare parts are rather expensive. My intention was to design a very cost effective solution!
So here you have a model for the front and rear wheel. Additionally, you need:
- rubber O-rings 75x5x65mm (3 for each rear wheel, 2 for the front wheel)
For the front wheel:
- ball bearings of the type 625ZZ 16 x 5 x 5mm (2 per wheel)
The holes for the axes need to be drilled to size, they are smaller by int