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Losi LOS261003 Seat, Battery Box Set: Promoto-MX Maxx Parts This 52 tooth layback differentialLosi LOS261003 Seat, Battery Box Set: Promoto MX The Losi LOS261003 combines a seat and battery box set built for the Promoto MX. The seat completes the bike's body while the battery box holds the battery securely in place during riding. Replace a cracked seat or battery box with this set to keep your Promoto MX complete and running. Genuine Losi part, number LOS261003 Seat included Battery box included Compatible with Promoto MX