mabinmaui

I'm in the market for 6cd changer and have been searching for one on ebay. My Sienna is 2005, LE, standard audio system (non-JBL) w/ a single CD player. I came across 2 different models in my search: 86120-AE053 86120-08210 Any idea what the differences are? And which one is compatible with my vehicle? I would also appreciate some help in understanding how to remove the existing unit. -Brian