991 911 Seat Problem

I have a 2015 Carrera 4 with standard seats (lumbar pneumatics and heat only). The center of the driver's seat cushion has popped out. I see two white tabs that should fasten the center cushion to the seat frame (inside the bolsters) but I can't get a good latch. The dealer says I need a new cushion; 4-5 hours of labor and the cost of the center perforated leather section. ANY suggestions? THANK YOU!