Hopefully this has not already been discussed, but I have searched and searched. I am wanting to put in a double DIN in dash navigation system is my 2005 STS. I have found the dash kit, but no one seems to know which wiring harness will work (GMOS-13 says for 06+). I would like to keep as many features as possible, but realize that I will lose the memory features that the stock stereo controls. I have the standard 6 disc, no xm, and don't care about on star. Looking at the Metra 2010 CES brochure they show a GMOS-100 systems that says for all GM. Any thoughts or experience with the GMOS-13 in a 2005?