You're looking for 7R gearboxes, Other PW's use the same ones so if you find a PW F150 or Jeep they are basically interchangable.

Amazon - https://www.amazon.com/Accessories-Speed12V-30000RPM-Electric-Replacement/dp/B07D83MT3L/ref=sr_1_13?keywords=7r+gearbox+power+wheels&qid=1659706119&sprefix=7r+%2Caps%2C106&sr=8-13