Just FYI, I have been informed (by someone who recently did this) that changing the plunger seal is a very delicate process. You MUST measure the static height of the plunger BEFORE disassembly or your basic setting will be off. Even if you do measure, there is no guarantee that setting will be accurate and you may need to remove it again to get it right.
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi