Ok Tim, in the sales data book, section 8 page 8 RPO 264 Ride control, It shows the seat and states "The companion seat is of conventional construction. New brown trim." Series 4000-6000 Ride control seat with deluxe trim RPO 264A Series 3000-4000-6000 Standard cab only RPO 264B Series 5000 Standard cab only RPO 264C and Series 5000 Ride control seat with DeLuxe trim RPO 264D. So as I read it, in a half ton (3100) it would be 264B and only on a standard cab? You have a better understanding of factory documentation than I do. Does it look the same way to you?