Home Depot sells them. It's a one quarter inch flexible extension with a hex socket (female) on one end and a male on the other end. Look in the area where the Riobe tools are.
I know this because I recently contacted the slide room manufacturer Accuslide to order a spare cable replacement kit. And one of those motor drivers. after they sent it to me I discovered it was the same as the one I already had in my tool box. .
JEGNCJC, the slide motors are located behind these panels over the main and bedroom slide.
As for the tool, you should have received two of them with your coach. They are part of the slide, one for each slide, same tool. Yes you can buy one but your selling dealership should have supplied them at delivery.