In my ‘13 it’s roughly behind the water control panel and water heater. Access requires removing the walls in the basement. There are screws holding them in place and are pretty easy to remove. Work slow as some of the screws are easy to overlook.
2013 F-350 CC SB 2WD 6.7PS
2013 Eagle Premier 351 RLTS
-SOLD- 2012 X23B
-SOLD- 2003 Ford Expedition 5.4, Bilstein shocks