installing deck in 2000 Deville? which interface? please help

[nfl2009 10+ year member]

what do I need to buy?

this

http://www.installer.com/item/display_item.php?it=GMAH32

or this

http://www.installer.com/item/display_item.php?it=GMOS-06

or something else?

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[prcwitt 10+ year member]

Not to familiar with those but Metra makes the GMOS-06.Amp interface, makes acc wire,and retains onstar.Used those before and work great.They usually retail for $120-$150 depending where you buy.