Looking for info on the upper ball joint, since the SBA is different from the RMK. I have everything to install, but need some clarification on fitments. The OEM RMK upper ball joint fits loosley in the zbroz arm. I would think this should fit snug to keep from moving on hard impacts. I might be wrong, this is the first set of zbroz arms I've installed. Hard to see in the pics but you can see the gap between threads and arm hole.