After a couple hours of net searching, it’s off to the dealer to buy the special tools for removing the stock head unit.   $8.00 for a thin piece of metal.  Porsche is the only manufacture ahead of Mercedes for the requirement of ‘special tools’ to do anything of measure on these cars.     I’ll be sure to post photos of these amazing tools once I get them.  Assuming they have them in stock, the local MBZ dealer in Fife is a real loser.

UPDATED:  As I suspected, the dealer did not have tools in stock.  I’ll be waiting a week for them to arrive.  I don’t know why they don’t have them.  These tools are not very big (small stamped steel keys) they are not very expensive ($9.65 with tax).    They are also used for many model years audio units.   I should have driven to Seattle where they likely gave them away on the counter as nicknacks!