Unless seasonal pollen is affecting my memory I've worked on the following: 81 300SD, 83 300SD, 87 300SEL, 91 300SE, 95 S420 -- all have 6-bolt transmission pans.

The cost of getting a transmission from overseas has to be greater than ~$1200 for a carry-in rebuild.

If a 722.315 from an 85 300D doesn't fit your car, I'll pick it up from your garage and take it back to the yard for you. Lots of caveats on that offer so ask first

Sixto
95 S420
87 300SDL