There is a plate that covers the hole. The trans bolts hold it in place along with a small allen bolt.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

I've just been told by a Mercedes parts dealers that there is no plate to cover it (which I don't believe)......... does anyone have any part numbers I can refer them to ??

Inasmuch as you and your companions are ACE fabricators,
make your own cover plate; 1/4" 304 should suffice.

If you can buy it, don't build it.

1/4" stainless is way overkill. The stock plate is ~ 16 G cad / zinc plated steel. V8 motors had a similar if not exactly the same plate.

Have a look at a South Atlanta based MB dealer, they have parts manuals on line. The part exists but MB sometimes has a strange way of listing parts.

I did find a cover for the hole in the oil pan / bottom bell housing area 120 014 00 33 $ 10.00

The dual starter mounts are for left and right hand drive cars. The starter was moved to passenger side to make room on the drivers side for the steering box.

Really?!

Consider it a component of the flywheel/clutch containment system.