Got one today, had a horrible idle, felt like a dead hole.
Balancer wobbling all over.
1998 C280. 71K.

Here was the break down.
112-035-08-00 Balancer updated $95.76
006-990-70-04 bolt $ 4.79
023-997-84-47 Main oil seal $17.50
labor charge of 1.6 hrs @ $95hr $152.00
--------------
Total to client $270.05
Not killing your timing cover PRICELESS

DR.D