Alpine CDA-7876RB

[VTHonda1]

Hello,
I'm looking for a tiny part for this car radio. Does anyone have this same radio, and not using it?
I've bought a universal adapter, after removing the factory fitted radio in my old Honda Civic. Unfortunately my Alpine radio is missing a piece needed to connect.

I would post a picture here but not sure how to.

Thanks for any help,
A radio and music junkie