It has been used for saloon cars/sedans, estate cars/station wagon, and coupés - under the Volkswagen Passenger Cars, Audi, SEAT and Škoda marques.
The BX platform was used for the Brazilian Volkswagen Gol (hatchback), Voyage (sedan, also sold as the Gacel or Senda in Argentina, Fox in the US, or Amazon in some other markets), Parati (3-door wagon/estate), Saveiro (pickup) and Furgão (van) models.
Instead, the design borrowed heavily from the Volkswagen Group A2 platform, being essentially a stretched version of it, and sharing the same transverse engine layout.
As with B3, the B4 designation is used to refer to the "Typ 8C" version of the Audi 80 and RS2 produced from 1991 to 1994, as well as the Volkswagen Passat B4, however they are not based on the same platform.
The B4 Passat was a face lifted B3 (receiving its own generation number is controversial), remaining nearly mechanically identical, but with entirely new sheetmetal, and an updated interior design.
The B5 platform (also known as PL45 under Volkswagen's revised naming scheme) returned to a longitudinal engine layout.
B5 platform cars can be equipped with a multilink front suspension and a Torsen centre differential for quattro or 4motion branded four-wheel drive systems.