Join Date: May 2010
Vehicle: 2005 SLK 55; 2005 SLK 350
Other Toys: Several past R170's
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There is a small button on one of the two fittings on the seat back - push that button, then lift the headrest.
You don't remove the seat-back from the seat, you remove the leather from the seat-back. It's much easier with the seat out and on a bench. You pry up around the edge to remove the leather.
I'd love to see some pictures of your replacements.