Because that is a different year of RAM truck. In CMS 2018, the Dodge DLC included the SRT10. In CMS 2021, they did not include the older SRT10 but, instead went with the 2016 RAM 'Yellow Sport' truck. Why? I have no idea. Maybe cuz people complained how the dlc for 2021 was just a re-hash of 2018 DLC? Or, maybe cuz people didn't like how the SRT10 was only a 2 wheel drive truck? Idk... Personally, I like how this version has the 4x4 version of the RAM 1500 as opposed to the rare (now classic) SRT10 RAM. But, I'm kind of a 4x4 enthusiast. I actually made my own config of the previous SRT10 to have a 4x4 model. It wasn't truly the SRT10 anymore at that point but, I didn't care. Just wanted a 4x4 version. lol