Here are the offical Kyosho ones:
http://www.infernosonly.com/Kyosho_R...p/kyolaw36.htm
http://www.infernosonly.com/Kyosho_R...p/kyolaw37.htm
Part numbers are:
KYOLAW36 for the Front Rear (the one you want)
KYOLAW37 for the Rear Rear (the one for the very back of the car)