This is a replacement servo saver assembly for your Losi LMT 2.0.  These will also fit other 25t spline servos.  

This 25T Belleville Disc Spring HD Servo Saver features a two step design that keeps the servo saver stiffer around the center while maintaining proper servo saver function. The Belleville Design provides tunable spring rates using combinations of Bellville Disc Springs. It includes 6 Firm Belleville Disc Springs and 6 Soft Bellville Disc Springs.