The ARP stud kits that are sold by most vendors have small diameter nut flanges and washers. Some overcome this by stacking the ARP washer with an OEM washer, or skipping the ARP washer altogether and just using the OEM washer. A likely better solution is to use nuts with a larger flange and washers with a larger OD. Courtesy of Mike Smith: M12 x 1.25 nut with bigger diameter flange: ARP part number 300-8307 M12 hardened washer with larger OD: ARP part number 200-8792 He recommends a torque of 85 ft-lbs
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