Repair piece for cabriolet

Hi,

My Cabriolet is a bit rusty at the piece where the top is held in place at the back.
Anyone know of a place where you can get a repair piece, instead of having to make it from scratch?

I have attached a few pics to explain.

Chortle will be the man to ask over in the uk….here in tha states I have had to replace the entire back side fro a donor on mine.