I looked up part # 002 545 92 05 at an MB web parts site. According to that site, this part is a fuel pump relay.
I noticed here at PartsShop, by just keying in 002 545 you will see more than one fuel pump relay and the 3rd set of numbers in the part number vary..ie..yours is 92. PartsShop shows no 002 545 92 05, but other variations of 002 545 xx 05.
1991 300-SEL - Model 126
M103 - SOHC
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