Hello The Warden
http://catalog.eautopartscatalog.com/mercedesshop/wizard.jsp?partner=mercedesshop&year=1985&make=MB&model=300-DT-001&category=B&part=Air+Cleaner+Bracket
1985 Mercedes Benz 300D Turbo
Part: Air Cleaner Bracket
"T" shaped
See also 617 988 01 11 rubber buffer mount and 617 094 02 20 for buffer mount heat shields.

B1020-47922 Air Cleaner Bracket $43.94

1985 Mercedes Benz 300D Turbo
Part: Air Cleaner Mount

http://catalog.eautopartscatalog.com/mercedesshop/quote.jsp?partner=mercedesshop&year=1985&product=B1010-21358&application=000029989
1985 Mercedes Benz 300D Turbo
Part: Air Cleaner Mount
18mm-40mm
For heat shield see 617 094 02 20.

B1010-21358 Air Cleaner Mount $1.89

http://catalog.eautopartscatalog.com/mercedesshop/quote.jsp?partner=mercedesshop&year=1985&product=B1010-21203&application=000037784
1985 Mercedes Benz 300D Turbo
Part: Air Cleaner Mount
octagon shaped

B1010-21358 Air Cleaner Mount $1.89

http://catalog.eautopartscatalog.com/mercedesshop/wizard.jsp?partner=mercedesshop&year=1985&make=MB&model=300-DT-001&category=B&part=Mount+Heat+Shield
1985 Mercedes Benz 300D Turbo
Part: Mount Heat Shield
Heat Shield Screen
for buffer at air filter
See also buffer 617 988 01 11 and air filter bracket 617 090 01 40.

B1011-21334 Mount Heat Shield $2.23

I do not like the open-element setup.
It is cheaper to stay OEM.
Try your local salvage yard for the parts you need.

Question: What type of hose should I be getting to go down to the crankcase nipple.
Answer: go to http://www.mcmaster.com/ and select the type you like.
Have a great day.

__________________
ASE Master Mechanic

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D

https://www.boldegoist.com/