[Help with radiator Shell/Grille 612/29´]

I have some questions about the radiator shell and grille.

I am restoring it and want to know what material are and in the case of the grille, it was polished or painted?

It has some little rust and some of black paint, so im not sure if its need some coat or treatment (like niquel or chrome)

[Parking brake on 29 graham]

Im trying to find info about the parking brake because im restoring a 612 cabriolet and the entire system is missing.

If someone has some pictures or schemes of how it is, please post it, or send it to me.

 

Thanks!