those hinge pillar parts are available but too late now, you got it fixed.
I would spray the area with some cold galvanising, sometimes called weld through primer. high zinc content. then the seam sealer
here is a link to that part that you fabbed up
https://aapd.net/door-hinge-pillar-p...y-pickup-55-59
and the other part
https://aapd.net/door-hinge-pillar-p...y-pickup-55-59
in case a lurker is also needy