Mercruiser Quiksilver distributor part #: 805185A36.  Was from a 2001 boat with a Mercruiser Thunderbolt IV ignition system and Mercruiser 350 5.7L V8 motor when an aftermarket ignition system was installed.  Will work with Thunderbolt V systems as well.  Included is the distributor and ignition sensor as pictured (no cap or rotor).