Definitely looks like the manifold seals to me. The two bolts have a matching pair on the other side.

To repair, you need to remove the serpentine belt (watch for a dead tensioner if it's like the M103 one!), remove the single 6 mm bolt holding the hoses on, unplug the compressor wires, and remove the four 13mm head bolts. Compressor will drop out the bottom with some wriggling about.

Remove the four bolts, replace the o-rings, and replace compressor. I'd get new hose set to manifold seals, too, they are NOT plain o-rings. Make sure you don't have grit under the bolts going back in.

Don't turn the compressor upside down or the oil will spill out.

Add a couple oz of oil when you re-charge.

That is, I think, a Nippondenso 10P15C compressor, just like mine.

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!