Lots of good ideas above. If none of those worked and I had this problem … hmmm …
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Buy a couple of those magazines that cater to classic truck restorations, “Classic Trucks” is one, “Vintage Trucks” is a another as I recall. There may be some advertisers in there that either has the cable, knows where to find it, can make it from scratch, or has another solution.
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Check at LMC Truck’s website to see what they have in the way of parts for that make/model/year.