For your 2003 Ford F-150, you will need the DeeZee Tailgate Assist Lowering System # DZ43203, as the # DZ43101 you referenced is intended for GM-branded pickups.
This item is not intended to assist in closing the tailgate, only in lowering. It has a shock that lowers the tailgate slowly to prevent damage to the tailgate and potential injury to the person attempting to lower the tailgate. I have provided a link to the installation instructions for this item.
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