Definitely get the HVLP (High Volume Low Pressure) pump. Diaphragm pumps are a thing of the past and just a point of failure that can dilute your oil. The metal spacer that came with mine I had to Dremel out a little as the bolt holes were just a bit off. If your bolts don't thread in or you can't get one started check the adapter.
370,000 miles with the stock type pump and never had a failure, where it put fuel in the oil. all my failures were the valves in the pump. Three pumps in that number of miles. One a genos which i didn't see much difference between it and NAPA besides the price.. Now if your those guys that want big power then, well I'm not one of them I want a reliable pickup. Everything old needs care just how you go about it. Good luck
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