I just changed the one on my Mom's car and the 00 00 part looked like it was fine. The car is a 1999 E320 with 26590 miles.

I put the side-by-side pictures up at the following location:

Pictures of HB (56k warning!!)

Total cost:

$65 for new HB and Bolt
$110 for tool to hold HB while removing bolt (Thanks to Phil of mercedesshop.com - Dealer wanted $275!!!)
$25 for miscellaneous other tools I didn't already have.

The procedure was pretty easy, thanks to the 2 5-foot pipes I used as breaker bars.