I know what the hell is this,,,the is a F2 740 and the rear of the drivers seat,,,customer said the sides of the seat makes a noise,,,,we found out the side lumber motors make a noise rubbing against the leather,,,,so what you see is the lumber motor on the right side of the seat. Here a look at the left side with the motor removed,,,,the motors are pop riveted in place into the seat frame. Here’s a better look at the side lumber motor,,,,you can see the screw that turns and pushes or retracts the lumber arm.

 Here the other side after I flipped it over,,,this is not a common problem,,,,I think this problem happens more often with very over weight people,,,,,this owner was a big guy.