UPDATE ON U.S. MAGS WHEELS:
They will make completely custom wheels! The only issue may be the price. I was quoted about $760 per wheel. After mounting and tax and all, it would be about $3200 for new wheels. That's not outrageous in the world of custom wheels, but a bit steep for me. I will have to save a few more pennies to afford them, but the takeaway here is that you can get custom wheels that will fit without modifications.