I used matching carpet remnants, cut them to fit the driver's seat, passenger seat and steps, then had non slip rubber applied and the edges sewn. They did four pieces for $125.00. They look like they belong in the coach.
Just a thought, unless you have animals that will tear up your seats.....why cover them. You cover them up, protect for ten years so that the guy that buys it used gets new seats. Enjoy the seats and when in storage cover them with old bed sheets. Typically, you won't put enough butt time in these seats to ruin them.