changing interior colors

you could always try using a black dye or paint for the seats if they dont have any rips or tears...ive seen it work really well before

Yup, did that on my ferd truck we restored a long time ago on some pieces that we couldnt find. Turned out real good, hard to tell it was ever done. A good upolstery shop can do it for you.
Keep year one in mind as they have some interior parts as well.