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David,
The 4 lug pieces show up mainly on donor live axle cars, everybody else with an IRS car upgraded during the build process to 5 lug either by using Lincoln LSC hub and rotor assembly on the 89-93 spindles or the later SN95 or 96 and up components. The front end was designed around the 89-93 fox components and adapted for the later pieces as they came into use. The T-bird IRS, FFR mounting cage and geometry has remained largely unchanged. A few cars have been built with Mustang Cobra IRS parts but the design was done with the T-Bird rear in mind. HTH
Frank
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