From what I can gather on the EPC, the lines for the optional cooler just screwed into the the oil filter housing itself. Only guess is 1041806310 as being the correct housing but wouldn't totally make sense as the EPC says that is an AMG part.

What I'll probably do is just buy a sandwich adapter with a built in thermostat for my oil cooler set up.

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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon.