Amazon.com: LEGO Technic 4x4 Crawler Exclusive Edition Set 41999 : Toys & Games
LEGO® Technic review: 42099 4x4 X-Treme Off-Roader | New Elementary: LEGO® parts, sets and techniques
LEGO Technic 4X4 X-treme Off-Roader 42099 STEM Toy Truck Model (958 Pieces) - Walmart.com
Ultimate upgrade for the 9398 4x4 crawler with pendulum steering (no servo needed). I also made a pendulum steering file in the rebrickable link you can download and have a closer look
Limited Edition LEGO Technic 4x4 Crawler (41999) Brand New and Factory Sealed | eBay