I own one of the most ignored Mustangs of the first generation. I have a 69 F code standard convertible. The truss head bolt that holds the convertible top locking mechanism to the top frame is constantly backing out. When it gets too loose to deal with, I have a 90* Phillips screw driver that I use to retighten it. I can't find a source for a replacement bolt anywhere. Most of the Mustang parts dealers only have bolts for 65-68 convertibles. Does anyone have any idea where I could acquire such an exotic part?