Terry wrote;
>>The rear speaker's are a different story.
>>The evaporator , housing , box, housing >>has to be dropped down to access
>>the speaker's.

I am not sure about the newer Wesfalias but on our '85 I was able to remove the grill from the front of the housing and reach in and remove the rear speakers and replace them with new speakers.  If I remember correctly there was also a piece of cardboard that needed to be moved from the front of the evaporator.
George
'85 Westfalia