Anybody using a WlToys 12428 (or similar, like Feiyue FE-03) will probably want better shock absorbers than the stock ones. The maximum length of about 95 mm for rear shocks limit quite a bit what can you use. 1:10 cars have a much better selection of shocks available, but their rear shocks are like 100-120 mm, which is too much for this car. For this I modelled & printed these risers, that attach with two screws to the existing top shock holes and which have four holes for the shock tops to allow some adjustability.
I wanted as much adjustability as possible so got these decently priced dual spring external reservoir dampers, they fit perfectly, as you can see in the images.