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You might want to consider an 8 1/4 rear axle for your coupe. They were available in a bodies, are 5x4.5 bolt circle, should be strong enough for your combination and car weight. There is also the option of a Ford 8.8 axle sourced from an Explorer, they came with traction lok differentials and 3.73 or 4.10 gears, however they do require some modifications to install. As for the rallye wheels, yes they do come in 15 in sizes, both factory and reproduction.