hi
sls is a great resource to look things up,
https://www.niemoeller.de/en/w113/w113/B042 is another one.
what i have done in the past is grab a screen shot of the schematic and e mailed the classic center to see if they have the part.
this also works for everyone else (K&K, Authentic classics, sl tech, vintage euro etc)
are you having an issues re connecting all the parts back together?
when i purchased new fuel lines i had a hard time re connecting those items because the new line was not bent just right.
what i did was to remove the CSV from the intake which gave me more freedom to wiggle parts together, then carefully re install the csv into the intake manifold.