You should be able to find a supplier on line. A simple extension can be made from flat steel plate. Figure the lenth and width drill holes and bolt on. My Jacks are Happy Jacks and have the swinging extension for the dually. If you are not set to work metal a custom weld shop should be able to make you a set of brackets.
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'03 F350 DRW 6.0 auto
2003 A990S Arctic Fox
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