Okey dokey. Those took a little rooting around on their site to find.
Didn't even know they had them.
Mustang Front End Individual Components 1964, 1965, 1966
The "take-away" is that they have the added positive caster (+3 degrees) already
built into the arm. The other major benefit is the Chrysler-style twist in ball joint.
Those are incredibly robust BJ's. And the normal uppers (K8036) don't really have
a strength issue but good quality 8036's have become a rarity- and Made in USA
units may very well be non-existant now.....
+3 arm doesn't need to be re-located down but looks to have the bigger 9/16"
mounting bolts (Next size up in diameter but down in bolt grade for increased yield
strength and greater snap resistance). Bushings are grease zirked del-a-lum and
billet steel pivot shafts.
Looks like a nice piece but no Negative Roll attributes. You get that from a shorter
arm and a lower mounting point.
So the bottom line question is "do you want/need the revised Negative Roll
geometry?" That's pretty much where the rubber meets the road.
ex-Global West GM