The Bridgestones would be the same size on the standard wheels as on the optional forged wheels. You WILL like the Bridgestones much better than the Goodyears. Don't even think about buying old Goodyears that have been sitting in a warehouse.
$380 for an oil pressure sending unit, even installed since they are doing the oil change, is robbery. Full retail on that sending unit is less than $100 and if they are doing the oil change, no more than 1/2 hour to change.
The oil chage will be expensive at the dealer. Labor cost to remove and install the belly pans. They will likely get you for 10 qts of oil and Ford fliter at full retail, about 150, then several hours labor.
You could ask the Ford dealer to match the Tire Rack or Discount Tire price on the Bridgestones and install them. I have actually been impressed with Ford dealer pricing on some name brand tires lately. They get a pretty good national account discount. IF they have proper mounting equipment but they should.