Thanks for reaching out, Kim!
It sounds like you're needing the Replacement 17-rpm Lift Motor for Dometic FanTastic B Series Roof Vents w/Powered Lifts which comes in White # FVK6010-81 and Off-White # FVK6010-80 colors.
If your lift motor looks different then please feel free to send in some photos so I can see if we have something that will work! view full answer...
The tee sizes didn't change at any point with the Demco SMI Air Force One so the Coach Air Kit part # SM99627 that you referenced would work for you. view full answer...