240D manual transmission rear seal replacement

[spdrun]

Does the trans need to be dropped to replace the rear transmission seal, or does it only need the driveshaft removed? Where do I find a manual transmission output seal for this car -- none of the Internet parts sites seem to have any manual trans parts?

Between the brake issues, the rust hole (since repaired), the new alternator and this, this car has been a hopping c**taroo in the last month or two.