[Coley]

It looks like the previous owner may have replaced the major (non-scroll) part of the seat.
This was done to a highlander that I had years ago....so it retained its original (vinyl) scroll portion, but the inner fabric was newer and different than the original houndstooth material.
That said, the scroll work vinyl you have their may be part of a highlander option that could be on your truck....because that is the highlander style of scroll work.
There is a very good upholstery guy on the website here ('Truckseats') who can supply everything you need there.
Does your truck still have its original SPID (build sheet) in the glove box?....if so post it up and we can start there.

My two bits.
Coley