Is it a 450 SL (Convertible) or a 450 SEL (4 door sedan, long edition) ??
Then you could try searching W107 / R107 for the SL, or W116 for the sedan..
If that wasn't new to you.. And what you are reffering to, is manual transmission.. Then I guess your stuck.. MB V8's weren't delivered with manual transmission..
OR, as I read now.. I guess yur looking for a place to look up what part numbers you have on your car..
Then try this page..
Каталог запчастей MB
Just click on cars, and then on W107 or W116.. Wichever applies..