Look in your owners manual. There are pics of where to find them.
Although, from the number you found you have a 8 valve 2,3 right? This motor is usually found as M102 in parts catalogue. Just remember to tell your shop what year engine was built and that it isn't a 16 valve engine.
Greetings
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'87 MBenz 190E 2,3 8vlv
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