[Tom Goldman]

John, I've used these on Mopars with the larger B body ball joints.
You may be able to use them on the A body by using a taper reamer on the spindle .
Stock car stuff, as HD as you're gonna find.
I've got them from Coleman racing products.
You can position them where you want it height wise to help bump and travel.
The taper is the same as the k727 joint.