Not sure if this was discussed before, but I wanted to share some pics. I started to notice a few number stampings on my body panels. Most start with an “H” then have two numbers after. I even found some on the window regulator supports. These are all I’ve found so far..
“H11” Left door jam, between door hinge bolts
“H12” On firewall. The HVAC part of firewall
“H16” Right door Jam. Just like H11
“H17R” Lower Right subframe support on firewall
“H13” Right window regulator channel, 90 degree support bracket (both brackets H13)
“3H” Left window regulator channel, 90 degree support bracket (R stamp from me)
“H50” Left window regulator channel, 90 degree support bracket (R stamp from me)

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