I bought a complete used set of low mileage, ding-free TP wheels for my '14 off a member @ one of the local Stang sites. Threw one in the trunk so I've got a full size spare now & have 3 remaining, sitting in the garage taking up space & collecting dust.
I'd be glad to sell you one of them but I can't imagine what the packing & shipping costs would be. If I can suggest, you might be better off checking out the local craiglist to see if someone swapped wheels & is looking to offload the old ones. But be ready to buy a set of four. I couldn't find anyone who was willing to break up a set.
Lee