If it were me I would begin with Thor parts. 877-855-2867. If they can't provide them ask for dimensions or drawings and have them made. Any upholstery shop could do it. Make sure you get the proper weigh material.
2017 Gemini 23TR Ford chassis w/ power stroke 3.2
DW, Daughter and 2 dogs, Sofie (black lab/boxer) and Phoebe (schnoodle)