Please help. Am in Australia and want to upgrade the shocks in my sons Raider. After day 2 the standard plastic red shock caps cracked. We purchased more plastic caps and they have cracked also. I have been reading the forums and have found that the trackstar aluminium shocks set https://hobbyking.com/en_us/alu-shock-absorber-set-35mm-12x85mm-2.html will be a relatively cheap replacement however I don't know what size to purchase. Can someone that knows please tell me?? I think I need 4 x 85mm. I have been researching for 3 hours. I don't want fancy, I just want my sons RC car to work. THANKYOU!