The Sportline will have also have a steering wheel that is shaped differently, as in the "Cars" tab article on Sportline , above. There is usually a split rather than bench rear seat. Also, the options plate under the hood in front of the radiator should have the number code 952 or 953, according to the options codes at:
http://www.geocities.com/MotorCity/Speedway/5350/mbcodes.htm
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John
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E