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This is what you need. When i bought the eclipse 5435 i went on crutchfield and bought the backup camera and the sirius adapter. The adapter is $99.99
Off crutchfield:
Connect the SIRIUS SIR-ECL1 radio to your compatible Eclipse stereo, and start enjoying SIRIUS Satellite Radio in the car. This in-car radio comes with the roof-mount antenna you need for reception and the cable you need to connect the radio to your stereo.