spray some dan tac or 3m adhesive on it and youll be good to go. if the liner is separating from the foam backing, then do a VERY light coat and let it get really tacky first so it doesnt soak thru the liner. if the liner is still attached to the foam backing, then soakthru wont be an issue.
i would just goto a junkyard and pull one from a newer ranger, like a 97 or something.
i have no idea what years will work tho, im going to assume 93-97, but the newer ones might work.
check on www.car-part.com