1996 mustang 3.8 DPFE sensor hose location please help

HI : the hose closes to the fire wall
REF: the hose closes to the plenum or the intake.
one hose should be bigger in diameter to the other. also a great upgrade is to get the aftermarket one its plastic. but have to remember gas fumes go through this and cause build up over time bc its metal. plastic cant build up bc there is no place for it to stick...