Could you Identify this rusted bit of body

Hi

I took the roof off at the weekend and the bit of the body see photos, is rusted and will need replacing. Could some one tell me what it is called so I can get the part. I assume its all pop riveted in and will just need drilling out and then riveted back in. Is this correct?
I also assume its all one piece.

Thanks

Its the back of a 90

body capping

Plenty life left in that capping yet - take it off and sand it down back to shiny metal then paint it.

bodie cappings and lots available on ebay galvanised ones are good

Cheers for the quick replies everyone. Now I know the name I can look into sorting it out!

Oh and Storm99 thanks for the advice! I always wondered why it went faster in reverse! Turns out I thought the front was the back! :tea: