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Have you looked at any alignment shops that specialize in driveline suspension issues. They should be able to get you anything you want. How about JC Whitneys ctalog. Thery handle about anything for a truck that I know off. Just a couple thoughts here. Good Luck. BTW nice truck in your gallery. I love 79s I love that color. Good Luck
You can also buy extended radius arm BRACKETS from Jeff's Bronco Graveyard for pretty cheap. Or at least a lot cheaper than new extened radius arms, but like you said you could fab up a set your self.