That third car is Cadillac's Catera model that I wrote about here. At the time I didn't show the Opel Omega that it was based on, hence the current post.
Further background on the Camera that offered by General Motors for model years 1997-2001 can be found here.
At the time, GM owned Germany's Opel firm and England's Vauxhall, the latter selling rebadged Opels with right-side steering. The Wikipedia entry on the Opel (and Vauxhall) Omega is here.
Cateras were based on the Omega B1 (1994-1999) and Omega B2 (1999-2003) that had few exterior differences. Even though Cateras were built in Opel's Rüsselsheim factory, they were modified to satisfy presumed American tastes for a sporty Cadillac. Unfortunately for GM, the basic Opel body was given only minor changes, and didn't strike potential Cadillac buyers as being enough like a "real Cadillac" to bother buying: sales averaged less than 20,000 per model year.