Pretty sure this is what you need, Traxxas # tra4615
https://www.amainhobbies.com/traxxas-slipper-clutch-set-tra4615/p17803?gclid=EAIaIQobChMIs_D38dXX_QIVCpbICh3Hcgu7EAQYAiABEgIM3_D_BwE
I had one of those for a long time, maybe 15years or so. It was the very first version before they made it wider which is what you have. I did convert it to a DeWalt 12 volt brushed drill motor which made it a little top heavy. I’d just replace that slipper, run it and have fun. Save the...