Dog leg repair panel

Does anyone know the part numbers or where to find repair panels for the dog leg section that runs between the rear of the rocker panels and the forward most point of the rear quarter panels?

I've found the 59 chevy counterparts online are they the same?  Sure looks it to me...

http://www.vintagepartsclub.com/servlet/the-14007/Chevy-4-Door-Outer/Detail