I have looked at my '67 AIM, I'm trying to figure out how long #3909140 is. It says in the AIM this bolt replaced #3831892 which I believe was 3/8" -16 X 1 1/2". I know it is supposed to have the point on the end with a 1" captured flat washer. I have several that are 1 1/2" long, and I think 4 that are only 1". This is the bolt that attaches the Rear Bumper Bracket to the Body. I believe there are 8. Any help is appreciated. Thanks.