Hey William,
To replace the just the lid of your Fan-Tastic Vent RV roof vent you would just need the Replacement Dome for Dometic FanTastic RV Roof Vents # FVK1020-81. If you find that the lift arm is damaged you can replace it with part # FVK8011-05.
If you'd like to protect the vent lid and prevent this from happening again you can also install the Dometic FanTastic Ultra Breeze Trailer Roof Vent Cover # FVU1500WH. This would allow you to leave the vent open during inclement weather... view full answer...
While your picture didn't make it through we do have what you are looking for Blake with the replacement puck plug covers part # 58199 which will plug the ones you have in the bed of your truck. view full answer...