I want to replace 2000 Sienna factory radio+CD with aftermarket multimedia center. I search internet and every sites says METRA 70-1761 fit 2000 Sienna (it also says it fit Toyota 1998 and up)

However, when I remove the factory radio and found two blue color connectors are connected to the factory radio. One connector is a 20 pins connector with most wires in it and the other connector has only two wires in it.
METRA 70-1761 doesn't match them at all and.

Can you let me know which Radio Wire Harness I should buy?

Thanks a lot!

Picture of METRA 70-1761 is at
http://www.amazon.com/Metra-70-1761-Wiring-Harness-Speaker/dp/B0002BEQJ8