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
Best Buy: LEGO Technic BASH! 42073 6210337
LEGO MOC 42073 Racing Tractor by c__r | Rebrickable - Build with LEGO
LEGO Technic 42073 Bash! 139 pcs Pull Back Crash Race Car | eBay