You can get alley key head sockets made for impact guns from sears or any other online tool store. You can just go a size bigger and hammer the tool in there then remove the nut. If its already F'ed you can try to get some leverage on it and just snap the entire stud off with the nut, replacing the studs is easy and cheap.
For new lugs, try Blox, Muteki, etc. tuner lugs, they can be had for around $70 for a set
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