What size speakers are in a 2003 nissan 350z 2003 Nissan 350Z - Shield Tech Security 2003 nissan 350z audio wiring wire color location notes radio 12v yellow radio harness front speakers size rear speakers size amp location notes 6.5"... Source Source Source Source Source Source Source Source Source Source Read Also: 2003 Nissan 350z speakers size 2003 Nissan 350z factory amp location What size speakers are in a nissan 350z Nissan 350z rear speakers size Nissan 350z front speaker size Nissan 350z speakers size