Amazon.com: GPM For Traxxas 1/16 Mini E-Revo, Mini Slash, Mini Summit Upgrade Parts Aluminum Front/Rear Adjustable Spring Damper (1.2mm,1.3mm & 1.4mm Coil Springs) With Aluminum Ball Ends - 1Pr Set Silver :
Traxxas Summit Zinc Plated Black Dual Rate Shock Springs Set - R/C Raven Inc