The lower gearbox seal can be replaced with the gearbox in the car. The Ford part number for the seal is D5AW-3591-AA, but I think it's only available as part of the seal kit. The lower seal kit is Ford part number D7AZ-3E501-A. The complete seal kit is Ford part number D3AZ-3C538-A. Try your parts supplier for the lower seal by itself. The parts book shows the gearbox to have two seals on the lower shaft with a spacer between them.
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