Interesting. The 06 RL does not have an MP3 port (a 3.5 mm stereo headphone jack) in the center console, but the 2007 forward does.
Similarly, the 06 backup camera is a dealer ad on. The distinguishing factor is the location of the camera. Assuming it is a "genuine" Acura backup camera, the 06 camera is located dead center rear where the trunk release used to be, and there is a new round button, not rectangular button trunk release about 4 inches right of center.
The 07 camera is mounted about 4 inches to the left of center, and the trunk release is a rectangular button dead center.
Both 06 and 07 display through the navi unit.
in answer to your other question, you do not need want Acura Musiclink if you have an mp3 port in your center console. You just need a double ended male 3.5mm jack. You can pay up $50 or more if you want to using premium cable. Go to any Radio Shack. Here is a cheap one.
Amazon.com: 3.5mm Stereo Male To Male Cable 3 ft.: Electronics
Otherwise, rather than musiclink, consider installing an aftermarket device, either the
Neo Car Audio iPod adaptor
Neo Car Audio :: The leader in OEM integration.
USASpec iPod adaptor
USA Spec
Either one works. I have the Neo. The USA is cheaper. It seems that the Neo is a rebranded USASpec.