I need to repair the sheet metal between the roof and quarter behind the back seat driver side but does any company sell that piece I can't find it

 

It sounds like something you'll need to get from a parts car. What year/model of car are you needing this for?

 

you could also make it and butt weld it all in.

 

72 cutlass supreme

 

If you are talking about the C-pillar, it isn't a separate piece, it's part of the factory quarter panel. The factory quarter is a one-piece stamping that goes all the way up to the seam with the roof panel. The problem is that the cheap-azz Chinesium "quarter panels" sold by repro houses aren't full quarters, just skins. No one sells the C-pillar separately.

This N.O.S. quarter is for a Cutlass, not a Supreme, but you get the idea.

 

I think I may have this from a parts car. I'll have to look and see.

John