The SLS is essentially an STS lengthened an additional 100mm (~4 inches) to give backseat passengers additional room to stretch out. In the press release accompanying the above photo, GM states ...

OnStar, CD changer and rain sensing windshield wipers were also available on the 1998 Cadillac Seville. Both the SLS and STS received the Cadillacs 4.6-liter V-8 Northstar engine paired with a ...