In looking at all my cars yesterday, I noticed that the first bumper from the front is about even with the carb wingnut. I say ABOUT. If you look at the rail you notice that towards the front of the opening there is a height difference. The bumpers would of course do no good in this area. Two of the cars had bumpers about 3 or 4 inches from the end of the rail near the wiper opening.One had on just one side. In 3 examples on the drivers side;1 car had first block even with front of master cylinder, 2nd car was even with front of power brake booster, 3rd car near back edge of master cylinder. 1 car had 3 on one side, one car had 2 two inches apart and none near the wipers. I'm sure this is more info than you need but like I said above, they go where they're needed. Put them in without glue so you can move them around after seeing how the hood closes. Mike