Need some references!

I don't know of any specific references but you could try the manufacturers web site. Then try the web site of the various sponsors of the ralley car. Whoever made things like the seat, the roll cage, the gauges, shifter, and anything else on the car may have pictures on their web site. Look at the decals for clues as to who sponsors the car besides Audi. Look for a web site for the rally teams that drive the car. The car has been a big time rally winner so the sponsors will take advantage of that on their web sites for advertising purposes.
Just some thoughts.