I'm offering castor correction for your swivel balls, new or used. Up to 3.5 degrees of correction with anti-rotation inserts. This will accommodate 2"-3" lifts bringing castor close to .5 degrees of factory. This will aid any lifted vehicle above 3" of lift too. I can machine for more correction but there won't be adequate room for a proper diameter anti-rotation insert beyond 3.5 degrees. Cost per pair is $120 with inserts or $100 without inserts.
Attachment shows 3.5 degrees correction with opposing anti-rotation inserts. Face milling of flange (shown) will not be done as it is unnecessary.