My car is an '95 E320 Wagon.

The part of the harness you show near the oil filter is separate from the main harness. It's the positive battery cable harness and contains the main wire to the starter and a few other misc wires. I replaced mine because it looked just like your picture. I think the price was < $100 several years ago.

I determined that the previous owner had replaced the main wiring harness; the new harness on my contains a very permanent plastic/paper tag wrapped around one of the wires behind the battery. I can look at it tomorrow and post the part number.

__________________
as ever
Paul

1989 560SL
1987 300SDL
1987 300TD
1983 BMW 633CSi
1972 280SE 4.5