Just a thought. Drive the vehicle to the autostore, if it is driveable. Tell them, you want a socket to fit that nut. I don't know the actual size? I've had several autstores let me borrow tools off the shelf, till I found the size I needed.
Usually your not supposed to reuse the old nut. I've seen aftermarket nuts that were not the same OD as the original nut. So that new socket you just bought, to remove the old nut, may not fit the new nut? Lots of fun.