Hi Buddy,
For spares can only say PBM racing or JE Spares either one best place.
I dont know of any other model shop that supports Kyosho as good as these two tbh.
Keeping spares in your box -
wishbones front/rear
front shock tower
spare slipper pads/spur gear
Thats all i have got in my box but i aint planning to break anything
Also i havent been running mine long enough to need any spares just yet