This is the Hitec HS-646WP High Voltage Analog Waterproof Ultra Torque Servo.
These are Optional Black Lower Spring Cups that fit most Traxxas & Losi shocks These cups fit on top of the shock end and hold the spring.
Hardened Steel Spur Gear 73t 48p, Orange: Traxxas (HRASTE873)
These are the RPM Blue A-Arms for all versions of the Traxxas T-Maxx. Optional Arms that replace the stock. (1) Upper Arm (1) Lower Arm (2) RPM Decals