There's a bunch of stuff that's not in the index or that the index doesn't point to properly. If you look through the engine folders, you'll see file names with an 'a' suffix. These are typically the versions for turbocharged engines.

e.g., 09-400 and 09-400a (air cleaner), 14-180 and 14-180a (intake manifold), and the list goes on.

Sixto
91 300SE
87 300SDL
83 300SD