1978 DeVille Headliner Retainers

[Sprocket]

Hey folks,

I did inherit a 1978 DeVille sedan. I did go through tuning the engine, troubleshooting a lot of electrical issues, a lot of fixing on interior door panels, and now I am tackling some of the cosmetic issues.

I am redoing the headliner which was falling appart. I manage to get all the trim pieces off without braking any plastic retainers  . Unfortunately whoever dealt with the car before manage to lose two of the retainers on the side of the headliner used to secure the metal trim. I scored the web for a week, without success, with the hope that I will find the two missing retainers.

Can anybody point me in the right direction?
I attached the picture for reference.

Thank you