Bushing for ST Series A Frame and Sector. Must be welded in. REQUIRES WELDING. Has a 5/8" diameter hole in it. IF your A Frame / Sector / Pivot Bar does not have bushings, you cannot add them. This is a REPLACEMENT part, to replace an existing damaged Bushing. It is also now OBSOLETE (2020), we have a limited number on hand (15) and when they are gone that is it.