Fits 2023+ Superduty F250/F350/F450/F550 Only 
It will make the castor 5 degrees +/- 1 while at 2.5" of lift.
Lower arm angle enhances ride quality. 
4 points of mounting contact to improve rigidity - an industry first 
Overlap welded for strength.
Provides the option to shift axle forwards 1/2" for more clearance when used with our Bumper Spacer Kit (101360)