If you cut one of the string things off so it doesn't stick out. you can make the rest fit well. I made a piece out of a hanger that holds the back ones in place. and i made a bigger hook that fits under the seat for the two down the side. The front (if you take the pocket off) will velcro to the front of the seat.
If it helps any, I've found seatcovers custom fitted on the mossy oak website. I've looked, and the 60/40 for my truck is uh... $200 I think? Those are the ones I'm wanting to buy. Those should be the same ones for your seats.