I can’t verify for these years but werent they leather? I know the models before these that I have worked on were.

The seat he brought me was peeling like crazy and i could see the mesh underlay, definitely vinyl. Unless they were reupholstered at some point, but they looked stock. It doesn't matter to me if the material is leather or vinyl, just looking for a colour match really.

I worked on an Audi a few months ago, leather facing, vinyl band.
Check with Coast to Coast Leather, GAHH, Veteran's company, they all carry leather and vinyl.
You may just have to match it up to something else as close as possible, that's what I had to do on the Audi I worked on.

Awesome thank you so much Mike! I'll contact those companies, see if I have any luck.

Another upholsterer had repaired part of the seat before the new owner had the car and they had just used a similar colour, so I imagine I might have to do the same.