Wow, that's nice!
As i know, the developing of Midtown Madness 1 and 2, there wasn't a 79 VW Van in the game files.
Maybe the dialogue talks about a traffic car, these that are roaming in the city.
I think it's the EuroVan or the hidden MiniVan.
Cannot be a 2001, the model is same as MM1 one so it's one of the earliest model years
The models between 2000 and 2001 are technically the same (I think, maybe the MM1 version has less polys. lol) but the game says other history.
Also i never found differences between these cars in real life, the 2000 and 2001 so that's why the developers haven't changed anything if they look almost the same.