Check out my Dog Back Seat Extender for Trucks on Amazon - https://amzn.to/41yhnMZ
The listing mentions that it fits F150 and Ram 1500, but it doesn't mention an F350 with 4 doors, so I took the measurements and tried it.
While it doesn't fit perfect due to my front seats with molded headrest, I found a way to make it work.

Follow me on Amazon - https://amzn.to/42N4nTu

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** Disclaimer Sheryl Loch is a participant in the Amazon Services LLC Associates Program and the Ebay Partner Network, affiliate advertising programs designed to provide a means for sites to earn advertising fees by advertising and linking to amazon. com and Ebay.com