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I had left it in the parts manager's hands and he said the 999-591-837-40 one has a different top and a shorter shaft. I may just buy two and be done wth it, but I'll wait to see what Ron from Sonnen gets back to me with.
Just to close this off, I had the parts manager reorder the 999 049 011 40 clips and took them to the car this weekend. They are shorter, but they work:
Shorter
Top is the same
The carpet is crushed a little more, but the mat isn't going to move.
Local Porsche parts manger tells me the part number for the long 'carpet push button' is N 90068501 and is for the passenger side heating duct cover just in front of the door.
The cover is held in place by 2 small screws by the door hinge and this button, which screws onto a metal pin located just below the bottom of the glove compartment.
It cannot be seen because it is hidden by carpeting.
The carpets are held in place by the shorter button.
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