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Turns out an airbox from a 180 HP Aviat Husky is an absolutely perfect fit on the Patrol including the angled air inlet connection for carb heat. These boxes occasionally get changed out if the bushing are worn but that’s an easy repair for us home builders. The airbox is the best I have ever seen, substantially built out of steel and just the right profile to clear the Patrol cowling. My local mechanic gave me an old one for free since they usually just order a completely new unit.