Left rear quarter panel
1965 Barracuda. I repaired the outer and inner, left rear quarter panel skins. After I installed the inner repair, I realized that I left out (what I will call a "drain vent.") of the piece I made. If it is a drain of the sort, it's not located at the lowest point on the inner skin. (see photo of right side) I hate to cut the new piece to make the drain. Question: How necessary is it to have it?