5x Harley Davidson Softail Standard1999-2015 Gold Titanium Rear Rotor Bolts 3/8-16 x 1". 5x Titanium Rear Disc Rotor Bolts with Pre-applied Threadlock for Harley Davidson Softail Standard 1999-2015. Made from Aircraft Spec Grade 5 Titanium our bolts are 40% lighter than the standard OEM Parts.