I have replaced the Aera 550 in my Sport Cub with an Aera 660, so I have the Aera 550, Airgizmo mount, and bare wire harness available. I also have a GA 56 GPS antenna (that I think was used with original 496 that was installed)

Garmin Aera 550, Airgizmo Mount and Bare Wire harness - $300
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Garmin GA56 GPS Antenna - $25
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Plus shipping / Paypal or Venmo / Ships from Austin, TX

Thanks,
Kevin