Thank you KA for starting the thread - you beat me to it
I have put together a list of available VWs and Audi taking the freedom to include VW Polos and Jettas as well as the bigger types of Audi 80s of which the Coupé was technically identical. Hope its alright.
The Volkswagens first.
*denotes turbo- or supercharging
A1- denotes Group 1 car transferred to Group A
Volkswagen Polo Typ 86
A1-5601 / 1975.07.01-198x.xx.xx / 896 cc / VW Polo
A1-5645 / 1977.01.01-198x.xx.xx / 771 cc / VW Polo + Audi 50
A1-5690 / 1978.01.01-198x.xx.xx / 1272 cc / VW Polo + Audi 50
A5028 / 1982.05.01-1990.12.31 / 1093 cc / VW Polo
A5031 / 1982.05.01-1995.12.31 / 1272 cc / VW Polo
A5139 / 1983.05.01-1995.12.31 / 1272 cc / VW Polo Coupe GT
A5438 / 1991.10.01-2001.12.31 / *1273 cc / VW Polo Coupe G40
A5439 / 1991.10.01-2001.12.31 / 1273 cc / VW Polo Coupe
Volkswagen Golf Typ 17 / Mk. I
A1-5583 / 1975.01-01-198x.xx.xx / 1093 cc / VW Golf
A1-5733 / 1979.01.01-198x.xx.xx / 1471 cc / VW Golf Diesel
A1-5731 / 1979.01.01-198x.xx.xx / 1588 cc / VW Golf GTI
A1-5732 / 1979.01.01-1988.xx.xx / 1471 or 1588 cc / VW Golf LS
A5042 / 1982.06.01-1985.12.31 / 1471 cc / VW Golf Diesel
A5069 / 1982.10.01-1988.12.31 / *1588 cc / VW Golf GTD
A5096 / 1983.01.01-1989.12.31 / 1781 cc / VW Golf GTI
A5172 / 1983.10.01-1987.12.31 / 1588 cc / VW Golf GTI
Volkswagen Jetta Typ 16 / Mk. I
A1-5802 / 1980.07.01-19xx-xx / 1588 cc / VW Jetta GLI
Volkswagen Scirocco Typ 53 and 53B / Mk. I and II
A1-5734 / 1979.01.01-19xx.xx.xx / 1588 cc / VW Scirocco (Mk. I and II)
A1-5735 / 1979.01.01-19xx.xx.xx / 1471 cc / VW Scirocco (Mk. I and II?)
A5175 / 1983.11.01-1997.12.31 / 1781 cc / VW Scirocco GTI 1800 (Mk. II only)
A5314 / 1986.11.01-1997.12.31 / 1781 cc / VW Scirocco 16V (Mk. II only)
Volkswagen Golf Typ 19 / Mk. II
A5212 / 1984.04.01-1996.12.31 / 1781 cc / VW Golf GTI
A5295 / 1986.03.01-1996.12.31 / 1781 cc / VW Golf GTI 16V
A5337 / 1987.07.01-1996.12.31 / 1781 cc / VW Golf Syncro
A5398 / 1989.12.01-1995.12.31 / *1764 cc / VW Rallye-Golf G60
And now some Audis
Audi 80 / 90
A1-5559 / 1974.04.01-198x.xx.xx / 1588 cc / Audi 80 GT
A1-5774 / 1980.01.01-198x.xx.xx / 1588 cc / Audi 80 GLE
A1-5808 / 1980.12.01-198x.xx.xx / 2145 cc / Audi 80 2.2
A5010 / 1982.02.01-1989.12.31 / 2145 cc / Audi 80 2.2
A5012 / 1982.02.01-1988.12.31 / 1588 cc / Audi 80 GLE
A5156 / 1983.07.01-1989.12.31 / 2145 cc / Audi 80 quattro
A5223 / 1984.05.01-1991.12.31 / 1781 cc / Audi 80 GTE/Sport
A5276 / 1985.07.01-1992.12.31 / 2226 cc / Audi 90 quattro
A5346 / 1988.01.01-1996.12.31 / 2310 cc / Audi 90 quattro B3
A5383 / 1989.04.01-1996.12.31 / 1984 cc / Audi 80 2.0 E
Audi Coupé
A1-5829 / 1981.03.01-19xx.xx.xx / 1921 cc / Audi Coupé 2.0
A5011 / 1982.02.01-1992.12.31 / 2145 cc / Audi Coupé 2.2
A5013 / 1982.02.01-1992.12.31 / 1921 cc / Audi Coupé 2.0
A5284 / 1986.01.01-1992.12.31 / 2226 cc / Audi Coupé Quattro
Now its time to pin point various cars!
Jesper