This may be stupid, but has anybody broke a good ford .8.8?? They're everywhere, cheap, and I suspect with the right parts combo, fairly strong.
If it's not obvious, 2002 up exploders are IRS, and use an 8.8. They're 71" wide fender to fender, z31's are 67". Seems like some negative wheels like corvette would fit under z31.(Yes, you can drill a corvette pattern on a Ford flange.)
Oh, bye the way, thanks for the link to dutchman 9", they're stumbling distance from me...