Help to remove.....
If I understand correctly, the plastic trim on the door sill is the seat part. And you also descibing the rear speaker covers.
For the sill trim...you have to remove the upper/shoulder seatbelt pivot. No big deal. The belts plastic covers prys of and the rest is a peice of cake, noting a screw and plastic tree fir fastener. Then this trim just pushes out from its clips. The center sill peice...just lifts off.
The rear speaker covers just push out from ots clips. Can't reca;;if there is a plastic tree. It is easy.
Good luck and good sound proofing.
Kenny







