Here's a couple pics of my vent. The vent's arms connect to the pivoting arms which their base is welded to the cowl. Hopefully the pics help. Please note that the pivoting points are I believe riveted, yet one of mine has a bolt and nut. This is from the rivet breaking and so I simply drilled out the broken rivet and grabbed an extra bolt and nut.
Craig
My '50 Chevy 3100 5 window, '62-235cu, 3:55 rear My truck ....... Respect The Rust If I'm not working on my truck, '65 m00stang or VW camper, I'm fishing with the wife or smoking Salmon.