Extra Long Bench Seat Mat, 21" deep, 63" long.

This size mat is offered for longer seats found in some trucks, SUVs, and RVs.
 
BusterBoy Mats are made with a top surface that gives traction for a dog's nails to grip, while the underside of the mat has a non-slip surface, so the mat itself doesn't slip or move on the seat.  Waterproof, heat resistant, and durable.