Bone fastener for a spinal surgical system

A bone fastener comprising:

• a receiver extending along a longitudinal axis between opposite proximal and distal ends, the proximal end including a first wall and a second wall that define an implant cavity therebetween, the walls each comprising an extension, the extensions each including a distal end coupled to a proximal face of one of the arms and a proximal end comprising a first locking part configured for fixation with second locking parts of an instrument, the extensions each being removably attached to one of the walls;
• and
• a bone penetrating member having a proximal end and a distal end, the proximal end of the bone penetrating member connected with the distal end of the receiver.

A bone fastener comprising:

• a receiver extending along a longitudinal axis between opposite proximal and distal ends, the proximal end including a first wall and a second wall that define an implant cavity therebetween, the walls each comprising an extension, the extensions each including a distal end coupled to a proximal face of one of the arms and a proximal end comprising a first locking part configured for fixation with second locking parts of an instrument, wherein distal ends of the extensions are each positioned in corresponding recesses in one of the proximal faces;
• and
• a bone penetrating member having a proximal end and a distal end, the proximal end of the bone penetrating member connected with the distal end of the receiver.