Hello GX Owners w/ Rear Backup camera.

I'm wondering if anyone knows if you can just purchase a Lexus OEM back up camera and hook it up?

I have an '03 model that has DVD & NAV, but no back up camera. Looks like they didn't come out until the following year.

I saw that someone had a local shop install an OEM back-up camera in the '03 GX for something like $400.

Any info, advice, or ideas would be much appreciated.

Thanks!