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Air Flow Researchs angle-plug location is slightly different from most standard angle-plug heads, pointing out and down as opposed to out and up. This limits header choices, although Hookers popular Super Competition series offers several part numbers that do fit. When our first choice with 13/4-inch primaries was on back order, we opted for PN 2207-1 with larger 17/8-inch primaries and a ceramic coating. Expensive, but good, and they dropped in with no hammer work at all.