So I have a '14 with the 19" x 8.5" luster nickel aluminum wheels. I just bought a guy's take-off 19" x 8.5" black with machined aluminum wheels from his '13. They're the exact same size, my car only has 2k miles, and I'm pretty sure the dealership is screwing me. Dealership 1: Wants to replace all 4 valve stems because they get brittle over time and the mechanics are likely to scratch the rims getting them in. Told him it only has 2k miles, he said they can get brittle fast. So $50 mount/balance + $21 per valve stem + tax = about $150. Dealership 2: $25 per wheel, not including any new parts = about $100. Guy told me if it was him he'd replace all 4 sensors. He didn't seem to know the sensors can detach from the valve stem or that they haven't used the belt style on the Mustang in years. He seemed rather offended when I called him out on it. He also told me they don't cost that much when I said that's nearly an extra $200, pretty sure he's wrong. I'm afraid if I take it to a tire place they're more likely to scratch my wheels, and if I miss some damage when I pick it up, they would just deny it later on. What do you guys think?