Sorry Baddad, I don't know what "Ivy Gold" really means. I will go out on a limb and say that any dark items such as carpet, headliner? , etc will be green and the light pieces such as seats would be the white. Since you have leather interior your car is an XR7, correct? If so, the seats themselves are leather. The seat back panels, map pockets and headrests are vinyl. The door panels, quarter panels and armrests are vinyl. If you have a console then the padded lid is vinyl.
I purchased my leather seat covers from John's Classic Cougars (
http://www.johnsclassiccougars.com ) for about $1500 if I remember correctly, and was VERY satisfied. They fit like a glove and look identical to the originals. Took me about 4 hours start to finish on the front buckets. (I plan to do a product review/How to on this as soon as I scan my photos and get some "extra" time...). I did not do the rear seat since it is still perfect.
I few years back I had a local place redo some leather seats for me. Had them done in vinyl that looked just like the original leather. Same grain and everything, but they still looked like plastic compared to the leather ones.
It's up to you, what you can afford, etc. but if you have an XR7 with the leather and go to vinyl, make sure that you do all of the seats or risk it being real obvious that some is vinyl. The vinyl feels different too.