I have a 2012 W166 (ML350) gasser 4Matic and I need to service the fuel filter and fuel pump. I know they are under the rear seat and I know the seat needs to be removed to pull back the carpet to access them. Tried to remove the seats last night with no luck. There are three visible fasteners on the double wide side (drivers) and two on the single seat (passenger side). After removing them, the seat backs will still not budge. Can someone tell me where the other hidden fasteners are and if you have any tips to remove the seat backs? Thank you.

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