This is for the 91 300E W124:

In there right now (changed about 5 years ago): Bosch 7578 HR9DC

Pelican parts says to order: Bosch HK-9-DC 7978

O'Reilly's just sold me: Bosch 9659 HR9 B1133V

Owner's manual says: Bosch H9 DCO
Beru 14 K-9 DUO
Champion S 12 YCC

Gap = .8mm (0.032 in)

I'm assuming I have a 3.0L because of the 030 after the 124.

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1991 300E 124.030 103.983KE 722358 03 412178
207K

1979 240D 123.123 250K (Project car)

2000 Ford Ranger, 187K

2015 Dodge Ram 1500 EcoDiesel 37K