Not quite MK1MADJ

The MK2 uses the AH profile key, most low end models got the black key with the chrome VW symbol, and the later 16v I think got the chunky keycover with the torch in it. Or perhaps it was an option?
The MK1 uses a HV profile key, which is completly different.
The exception to this rule could be the MK1 Campagn, which might have had the AH profile key, as well as the later cabbies

Edit: Forgot to mention, if you want a key blank get yourself on ebay, loads going for cheap. I got a pair of 'hong kong specials' and they look identical to the original keys, but the metal blade isn't quite as good quality, it can bend if you arn't carefull. There were several genuine AH keys on there last time I looked, also give
http://www.gpcvwaudi.com a ring, they have a ton of chunky 16v keys on egay at the moment!