Hy pghblacksmith, you need a parts book that covers your truck year and model/size. As to the "exchange" book, I assume you mean an interchange book, Napa's website has an interchange feature that you can use once you have the o.e.m. part number, in our case GM part numbers. Rock Auto's website can cross numbers from other parts suppliers. And there is a massive book called the Hollander interchange which wrecking yards usually have, but they are very expensive, and each book covers only a few years range. For our trucks you would be looking for a very old issue, hope that helps.
