'74 is an odd ball year.
Early production '74 cars got shock mount bumpers and the frame rails only had 1 hole for mounting the shock mount brackets.
Then, around late December, there was a production issue with the shock mount bumpers. So, late December through the end of the production year the cars got non-shock mount bumpers. But they got all 3 mounting locations, like mine did.
So if you have a '74, check your frame rail. If it was made mid-year on, it should have all 3 mounting locations. If it was August '73 to December it probably only has one.
And that's all for the front only. The 74's all had shock mount rears.