ipod to factory radio

i have search this forum and found some help but..........
i have 04 silverado with bose and xm. i don't use and care for the xm. so i found that is i use this interface i lose my cd changer which i want to keep. http://www.crutchfield.com/S-ziZ2ODcTNIl/cgi-bin/prodview.asp?I=469GM12AX2

if i use this interface which one do i use they list two of them. http://www.logjamelectronics.com/soundauxgm.html

any suggest on what to do and are there any others?

FM TRANSMITTER ARE OUT OF THE QUESTION. I'm only asking about a direct connection.

thanks
josh


"support search and rescue.............get lost"