avn 30d and sir ecl1

I have a 2007 Honda Civic with the dealership sold Eclipse AVN-30D navigation unit.  The unit has been great so far and, given now I'm looking to install a Sirius Tuner.  I know there is a supported tuner for the AVN-30D, the SIR-ECL1.  Unfortunately, dealer is charging more for installing it than I want to pay, so I want to do the work myself.  Problem is, I've read on this forum and one other that the AVN-30D does not have an E-Lan plug (which SIR-ECL1 uses).  It's looking like I'll need some type of adapter.  Anyone know where I can get this?  Both questions I've seen posted had the user stating he figured it out, but no answer was actually provided... So, I'm hoping someone here may know..  Thanks!