C Post Repair

Does anybody know where a C post Lower repair section can be bought?
Or is it a DIY Fabrication?

 

Outer or inner ? Got pics ?

 

I diy'd mine. The outer skin is covered by the rear wheel arch panel. I had to fabricate a bottom inner (a triangular 'ramp' shape that I welded to the sill and to the solid remains of the pillar in nice thick steel. Very easy and covered up so no need to be too neat - just wack up the power for good strong welds.