I've been comparing the 69 subframe to my 68 subframe. The only difference I see is the reinforced area for the bump stop is in the front instead of the rear. For each of my tapped holes going down the side of the frame, there now are a couple extra. I do not see in difference in sway bar or sterring mount locations.

Any aftermarket comports such as lower control arms are made to fit either the 68 or 69 frame. Sway bars are listed for all 3 years. Upper control arms does not matter.