I need a subframe for a 1969 Camaro project. I am told that there is a difference between 1967-68-69 subframes. Not sure what, if any, these are. Can anyone shed any light on this?

 

On the 67, the bump stops for the lower control arm were bolted onto a bracket that was welded onto the frame.
In 68/69 the bump stops were moved to the A-arms.
Basically, that's about it, other than a few different holes but they are all interchangeable.