Sportster 5 Aux in for iPod...

Hello--
I want to get the Sportster 5 Aux in for my 2002 Ford Explorer Limited. I plan on connecting the radio via an FM Modulator. However, I would really like an aux in on the dock of the radio to plug my iPod into (and listen through the FM modulated connection). Do these new units come with this? If not, I've seen some websites listing the SUPV1 accessory kit as having an 'optional aux in' jack on the included dock. Is this still on these docks and will the SUPV1 dock work with the sportster 5?

Thanks!!

www.siriusxmfan.com has alot of forums about these kind of questions.