rubber turbocharger seals
 

i've searched and can't find the thread showing the 2 rubber seals that look like top hats that fit inside the turbo charger and help with the boost. it showed a part # for these and the cost was really inexpensive like a few dollars a seal and there are 2. i hope you can help me out with the part #. if i recall that post was like 4 years old. it said they were not essential, but helped with the turbo lag, or boost. if i remember correctly the other part mentioned were o-rings part # 0289977948. the part # for the rubber top hat seals might be 279 18 100 80, but when i try that number i don't get a hit on any parts site. any help is greatly appreciated.
thanks, harv
p.s. the top hat seals are the same for all turbocharged mercedes.
my car is a 2004 mercedes cl600