Well, I decided to e-mail Redline oil corporation to see which two of these Redline products are compatible for my E300 diesel and also asked them if they were safe to use in my car with the catalytic convertor.

1) Redline 85 Plus
2) Redline Diesel Fuel Catalyst

Redline response was:
Thank you for contacting Red Line Oil, both products would be
suitable for use in your diesel Mercedes, they will not harm your
trap oxidizer or catalyst, though they have not been specifically
submitted to Mercedes.

I thought only one Redline diesel additive was approved for cars with catalytic convertors? Am I missing something here or is redline wrong?
I would hate to use the wrong additive and destroy the convertor in the process. Does anyone out there know which one to use? Thanks!