Do you have salvage yards in your area? If so that is where I would start.
right next to the starter. depending on the tyle of the truck its not hard to find. I have 2. One is in a 67 f250 and if I turn the wheels to the drivers side and get under the truck and look above the frame they should be right there. The other is in a 1980 F150 and I have to look at it from the top which is dificult. Hope this helps
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Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them