Put the fuel addative in full bottle and have it a little stronger than it would have been, no harm. None at all.
If you have part number you need to check after you find them on line, you or I can look them up on the EPC online program with your exact VIN and car type from Europe and confirm that it is the part you need since you have to lok them up with a diff car and year. The Online parts system can confirm that the parts are correct, it does not give MBs current price, but it gives everything else, including how many of the part is used throughout the entire car. So for say the vac elbows, it shows how many you need.

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red