Call Phil at Mercedes Shop
The part numbers you see on Fastlane are not cross referenced numbers but ones that Fastlane gave locally. I think there was a problem in the past with p/n theft so they opted this method. Their parts do have actual MB part numbers. If you give Phil a call at Mercedes Shop listed on this site, he'll be more than happy to ensure you recieve the correct part you are seeking.
"Tell me and I will listen, Teach me and I will learn, Show me and I will accomplish, Involve me and I will succeed."
'84 300SD 256,000 Gold on Brown (Mileage Award)
'86 300E 246,000 Blue on Tan