Must be nice to have a dealer open on Sunday 
How far do you want to go with your Sport conversion? The headlights are different too.
The bumper brackets are not the same between the sport and the Chrome bumper. The $305 you were quoted was most likely just for the bumper cover. There is also a support bracket that the bumper cover mounts too (found only on the Sport models). And the bumper brackets themselves are different. If you need the PN's for the additional brackets I can dig them up. I do not remember the exact cost but these brackets but they will cost you over $200.
Obviously the grill is different but good luck finding one for $70. The aftermarket ones I have seen are $150 and at the dealer they are over $300. The grill bracket and hood latch are different between the two style grills.

How far do you want to go with your Sport conversion? The headlights are different too.
The bumper brackets are not the same between the sport and the Chrome bumper. The $305 you were quoted was most likely just for the bumper cover. There is also a support bracket that the bumper cover mounts too (found only on the Sport models). And the bumper brackets themselves are different. If you need the PN's for the additional brackets I can dig them up. I do not remember the exact cost but these brackets but they will cost you over $200.
Obviously the grill is different but good luck finding one for $70. The aftermarket ones I have seen are $150 and at the dealer they are over $300. The grill bracket and hood latch are different between the two style grills.