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4. The AIM knuckle use six M12 high-strength bolts that are 12 mm in diameter (0.47 inch), are Class 10.9, and come with two alignment dowels to attach and locate the portals. The upper kingpin retains the stock bushing and spring design, but we are considering other options if the added leverage of the portal box causes problems. We reused our OTT Industries five-bolt high steer arms, but the knuckles can accommodate up to a six-bolt steering arm.