Re: 2002 Toyota Sienna help
Junkyard would be your best option. However, since you are talking the JBL sound system, your chances of finding a replacement just went out the window. What I would recomend doing is to get the size of the driver and then purchase one of the same size online somewhere, OEM quality. My recomendation however would be to purchase a nice component system for his birthday, christmas, or whathaveyou and then install it for him as an added oomph in the gift giving.
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Audiobahn = teh sux