Coming off their road win over the Packers, the Dolphins went home for a Week 7 intraconference duel with the Pittsburgh Steelers.  The Dolphins delivered the opening splash in the first quarter with a 39-yard and a 23-yard field goal from kicker Dan Carpenter.  In the second quarter, the Steelers took the lead with kicker Jeff Reed getting a 22-yard field goal, followed by quarterback Ben Roethlisberger completing a 21-yard touchdown pass to wide receiver Hines Ward.  Miami would respond with Carpenter's 22-yard field goal, but Pittsburgh struck back with Roethlisberger's 53-yard touchdown pass to wide receiver Mike Wallace.  The Dolphins would close out the half as quarterback Chad Henne found wide receiver Davone Bess on a 25-yard touchdown pass. The Steelers added onto their lead in the third quarter as Reed got a 39-yard field goal.  Miami would answer with Carpenter's 37-yard field goal.  The Dolphins regained the lead in the fourth quarter as Carpenter booted a 40-yard field goal, but Pittsburgh answered with Reed making an 18-yard field goal.  The Dolphins tried to rally, but the Steelers' defense held on for the win.. How many yards shorter was Reed's field goal than Carpenter's in the fourth quarter?