They are from Schumacher
http://www.racing-cars.com/pp/New_Ca...SV2/U3934.html
The last mod I made to the car was a shorty lipo across the back, zero trail knuckles, +8mm chassis along with trishbits noseweight. I also made a brass weight to fit right under the pinion. It ran pretty good in the dirt, the lighter lipo helps alot.