Traxxas 3997X Motor Plate (For Single Motor) 

Plate, motor (for single motor installation, use gear cover #3977X) 

The E-Maxx was designed from the ground-up to handle extreme brushless torque and power. Traxxas makes it easy to convert from dual motors to a single brushless motor setup. Choose your favorite electric power plant and bolt it in using the Traxxas single motor gear cover and blue-anodized aluminum motor plate. These parts give your brushless install a clean factory fit and finish (requires #3977X)  

Fits Traxxas E-Maxx.