afik, the only year and model that had that filter setup was the 85 300D california edition.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

The California 1985 300SD have the same setup also.

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'85 300D Cal 280,000 miles
'14 GLK 350 60000 miles

Actually, the whole transmission is the same as 86+ 300D's, I understand. I found that out when I replaced the front tranny seal while swapping engines. The turbo-charger, intake & exhaust manifolds, and exhaust down-pipe are all different too. Also, the battery, starter, and alternator have heat shields, and I think the starter differs too, or at least the solenoid is clocked differently. When I installed the 81 engine, its down-pipe bolted up and the 85 starter fit. In general, 85 CA accessories (passenger side) fit 84-, but not the reverse.