They all use the same one as long as it a Delphi ,which yours is, from 03 - 06
It's version 5.0 I believe I'll go look at mine there is suppose to be a newer version coming out but have not seen it yet for sale
Part No. Description Region Cost In Stock
15906573 GM NAV DVD 15906573 North America $199.00 Yes
You can also get the current version on the Delphi web sight now. They have labeled it Version 2 but it is the same disk with a Delphi logo instead of the GM logo. I think it sells for $177 on that web site. The Gm disk 15906573 is labeled Version 1 on? the label of the disk but the file on the disk a file called "version.txt" calls it version 5. Talk about confusion?
The only diffirence in the 4.1 (last one before current) and the current one is street and IPO updates. It is my understanding that a new version will be out in 90 days. I do have a spare 15906573 GM disk? if interested PM or email me. firstname.lastname@example.org
Anyone know if the correct vehicle make logo (e.g., Chevy, GMC, Cadillac) will appear on the nav screen at bootup if the Delphi nav disc version is used instead of the Chevy or GMC one? Just curious because I notice on Ebay that there are a ton of Delphi-branded 5.0 discs up for auction, but hardly any--if at all--of the Chevy/GMC-branded 5.0 versions (aka p/n 15906573)...