Vader Helmet part ID assistance request

[Jimmer]

I received a 3D printed Burned Vader Helmet as a gift and was hoping to do one upgrade before painting.

It's lacking the silver pieces (2 on the helmet) that are on each side of the "chin" or "mouth" piece.
They look a bit like tire valve screw caps.

Does anyone know what these are in our world? Lol.
I realize they're damaged on the prop, but I think I can make them work if I can find them.

Thanks in advance

 

[viewoptic]

If you have not done so yet I would recommend asking on the sithlord detachment forum found here: https://www.501stsithlords.com/

 

[Jimmer]

If you have not done so yet I would recommend asking on the sithlord detachment forum found here: https://www.501stsithlords.com/

Thank u.