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When you say they have a S550 rear-end, that is typically referring to the differential and the uprights. Ford Performance sells both into the replica market for that specific reason.
I know that Hurricane and Factory Five both use those components. Was unaware Backdraft has gone that direction also but doesn't surprise me. They used to use a BMW system but Ford is readily available.
With that said, all take a different set of control arms and half shafts. No way to use the Ford stuff, it's too wide.
Same applied to the older T-Bird units. Differential and uprights were standard Ford components. Control arms and half-shafts were special.
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