I've been lurking off and on for a few years. My son has a 1971 240Z that he used as a daily driver and then he moved and left the car with me. It's been in storage for about 5 years. He's moved back to Houston and we are going over the car to get it back roadworthy. I'll probably have questions during the process. One I have now is: what size are the front swap bar bolts where it mounts to the frame? Thanks, Dan