The accumulator is called the fuel accumulator.
I checked to see if it is listed in the PartsShop catalog, and it's not.
Call Phil at the 1-800 number and he can help you.
If you do a search for "accumulator", here is what you get:
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".