Lego Technic combinations: beast on the left side is 42072+42073 (BASH and WHACK) while beauty on the right side is 42058+42059 (STUNT TRUCK and STUNT BIKE). : r/lego
Review: 42059 Stunt Truck + 42058/42059 combiner - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
LEGO Technic Stunt Bike 42058 Advanced Vehicle Set : Toys & Games