2.1 Litre waterboxer engines, according to Wikipedia:

U.S.:  2.1 L (2100 cc) (95 bhp) (Serial # MV) Wasserboxer, used until
the end of Vanagon importation into the US in 1991.  This engine used
a more advanced engine management system known as Bosch "Digifant I"
which now digitally managed ignition timing as well as fuel delivery.

EUR:  2.1 L (2100 cc) (90 bhp) (Serial # SS) 9:1 compression ratio Wasserboxer

EUR:  2.1 L (2100 cc) (112 bhp) (Serial # DJ) 10:1 compression ratio,
Digijet injection, only sold in European countries not requiring
catalytic converter.

Geo/ATL