yes just 3 bolts each side easy to remove
Sorry, Can't comment on the M103 but I assume the M117 is similar. There's a grill cast into the bell housing with an opening to access the drain plug. Have a helper either under the car watching for the plug to come around or turning the engine while you watch.
Once you've rotated the engine around so that the drain plug is at the bottom, do yourself a favor and mark the crankshaft pulley so the next time you can just watch for your mark as you rotate the engine. I just used a Sharpie.
Here's the section from the manual.
I was driving to the office thinking, "Wait. The W126 had a cross beam at that spot shown on the W124. Gonna have to ask about that." And I remembered looking at that cross beam and not finding the bolts to remove it. It looked like it was fully integrated into the suspension. Which is a lesson on why I should wear my regular glasses when working on the car.
Thanks to all of you for the advice. And that link to that manual is amazing!
I'm looking forward to crawling back under there and getting this thing bad boy to where I can actually drive it more than 5 minutes.