So I came to the RDX from a Honda CRV and I'm missing a few things the CRV had. One of those is the parabolic mirror they have on the sunglasses tray just above the rear view mirror. Does anyone know if the CRV part will fit an RDX?

 

I seriously doubt it - they are different shapes. The Honda is more squared off, and the Acura is more trapezoidal, never mind the measurements.

If you look on Amazon there are a bunch of rearview/backseat car mirrors you can get for $10 or so.