Hi everyone I'm new to this site. I have a question I hope you can help me with. I need a 71 Mach I honeycomb panel. I have been told there is a difference between the 71 Mach I with the pop open gas cap and the 72-73 panel with the twist on gas cap. Is this true or will the 72-73 panel work on my 71 with the pop open cap. Thanks, this is a great site.