All three items have been added by previous owners, presumably, but wouldn't have been standard equipment as new. Dunno what that first item is next to the alternator!? The second one looks like it might perhaps be a kill switch to stop an electric fuel pump in the event of an impact. But I'm probably wrong! The third piece looks like it accepts a screw-in temperature sender to control an electric fan. If the temp sender can be changed when it fails without having to replace the whole pipe section in the top hose, that's quite handy.