2009 Pontiac Vibe Head Unit Install

[bosk]

I just bought a 2009 Vibe and was looking to put my Alpine ida-x305 in. I looked on Scosches website and they say to use TA02B but the pins are completely different. They then said I have a factory amp and it was under my seat--none to be found.

Called Metra and they say I can use a 70-2105 or a GMOS-LAN-012 (That will retain onstar). Scosche has GM21SR that looks comparable to Metras GMOS (similar compatibility with makes and models). Suggestions?

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