Sticky: Acadia Radio Part/ID Numbers and Option Codes
 

Info from Car-part.com, thinned out to remove XM and amplifiers.

2007:
Bose system-CD player-DVD-navigation-voice recording microphone "U3R"
AM-FM-stereo-CD-DVD-MP3 "UVA" Part # 25840248 (per GM parts book in 2009, actual ID may be different)
AM-FM-stereo-audio disc player-DVD-navigation-voice recording microphone "UZR"
AM-mono-FM-stereo-w/single CD player-MP3 "US8", ID 25802585
AM-mono-FM-stereo-w/single CD player-MP3 "US8", ID 15944643
AM-mono-FM-stereo-w/multi CD player-MP3 "US9" (not available with overhead DVD, will not play a DVD)

2008:
AM-mono-FM-stereo-w/single CD player-MP3 "US8", ID 25802585
AM-mono-FM-stereo-w/single CD player-MP3 "US8", ID 15944643
AM-mono-FM-stereo-w/multi CD player-MP3 "US9" (not available with overhead DVD, will not play a DVD)
AM-FM-stereo-CD-DVD-MP3 "UVA" Part # 25840248 (per GM parts book 2009, actual ID may be different)
Bose system-CD player-DVD-navigation-voice recording microphone "U3R", ID 15906630
AM-FM-stereo-audio disc player-DVD-navigation-voice recording microphone "UZR", ID 15906629
Bose system-CD player-DVD-navigation-voice recording microphone "U3R", ID 25801668
AM-FM-stereo-audio disc player-DVD-navigation-voice recording microphone "UZR", ID 25801667
AM-FM-stereo-audio disc player-DVD-navigation-voice recording microphone "UZR" part #25897058 (the unit with DVD) per member loach in this post.

Also per that post, the GPS antenna part # is 15255334, and the Nav disk part # is 25880099 (shipped separately from the gmnavdisc center).

GM parts book data for 2007-2008 Acadia circa May 2009:
25827117 shows as MP3 radio (appears to be US8)
25827118 shows as Cassette radio (appears to be US9 multi-cd unit, offered 2007 and 2008 only)
25925496 shows as navigation radio (no other data available, same part # for both book listings)


2009:
AM-FM-stereo-w/single CD player-MP3 "US8", ID 25941925
AM-FM-stereo-w/single CD player-MP3 "US8", ID 25974805
AM-FM-stereo-CD-DVD-MP3 "UVA", ID 25843717
AM-FM-stereo-CD-DVD-MP3 "UVA", ID 25999289
AM-FM-stereo-audio disc player-DVD-navigation-voice recording microphone "UZR", ID 19117428
AM-FM-stereo-audio disc player-DVD-navigation-voice recording microphone "UZR", ID 25975939
AM-FM-stereo-audio disc player-DVD-navigation-voice recording microphone "UZR", ID 25982653
Bose system-CD player-DVD-navigation-voice recording microphone "U3R", ID 19117425
Bose system-CD player-DVD-navigation-voice recording microphone "U3R", ID 25823340
Bose system-CD player-DVD-navigation-voice recording microphone "U3R", ID 25975936

Per the 2008 and 2009 ordering guides (could not find data for 2007 model year):
US8 is the base radio and will not play DVDs.
UVA is the non-navigation radio used with the overhead DVD player and will play DVDs.
U3R is the navigation radio for vehicles without the overhead DVD. THESE UNITS WILL NOT PLAY A DVD!
UZR is the navigation radio for vehicles with the overhead DVD. These units will play a DVD.

2009 radios are different. This is presumed to be due to the Bluetooth as standard equipment.

Some part numbers can be looked up here for more information- use "Search By Keyword" at the top of the page:
Radios and more

Will update as more info becomes available.