An old post that I responded to 15 yrs. ago. Would like to add a comment. Maybe it will help someone else down the road.

The OP asked what gasket part number to use for an M103 fuel Filter. My response was 007603-012102.

If by chance you order a fuel pump from wherever and it does not come with gaskets, you will need the same 2 gaskets - 007603-012102.

Also - the comments on the 2nd thread above that list SAE sizes 3/4" & 7/8" were for the counter nut(s) used on the fuel filter I used at that time. These sizes will vary, depending on the fuel filter purchased. Since then I have seen many different counter nut sizes; some metric; some SAE.

The 007603-012102 gasket is harder to find these days 3rd party. I have found that in this case the easiest(maybe not cheapest) place to source them is at an MB dealer.

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"