I believe different floor pans are fitted according to whether the vehicle has a single or twin exhaust. If you purchase the load floor kit to accommodate a spare wheel, it comes with two floor assemblies, a raised floor for vehicles with a shallow wheel well and a wide floor panel that retains the existing floor level for vehicles with the deeper wheel well. I've always understood that this is due to the type of exhaust that was fitted and the available clearance under the floor as a result.
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