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Knuckle arm bolt in OEM Nissan or aftermarket copy of original. Unique bolt size for this application only. There are two different bolt sizes that hold the knuckle arm on and this bolt is 40mm overall length (30mm under head length). This bolt will fit Datsun 240Z, 260Z, 280Z and 510 1970-78. The knuckle arm is located on the front suspernsion under the strut housing. Only 2mm difference in length between the long and short bolt.
*Both bolts are the same spec, thread length and head size.
