Mustang wheels on a Spider

["Bain, Bill" <Bill.Bain@domain.elided>]

OK, after putting more wear on my new street dunlops than I'd like at
the autocross yesterday, I've come to the conclusion that a second set
of "performance" tires might be a good idea.  I can tow a small trailer
since my Spider has a trailer hitch and I vaguely recall that certain
Ford Mustang wheels can fit a Spider with minor modifications.  Is that
any 4 bolt Mustang wheels or a particular type?  I searched the Digest
but only found 1 reference to a car being prepped for the 2002
Grassroots challenge.

She-Who-Must-Be-Obeyed is not about to spring for a set of 15x7
panasports, so I'm looking to see if there's a low-cost option . . .
TIA

Bill Bain 
AROC Atlanta 
'83 Spider (fun in the parking lot!) 
'87 Milano (fun to drive generally!) 
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