Adjustable mounting system for a door lock

A mounting system for a door lock, the mounting system comprising:

• a chassis;
• a fastener, and
• an attachment bracket configured to move between a first position and a second position relative to the chassis, wherein the attachment bracket comprises:
• at least one attachment post extending along an attachment post axis,
• a retaining plate affixed to the at least one attachment post,
• a first hole, and
• a second hole,
• wherein the chassis further comprises at least one aperture through which the at least one attachment post passes, wherein the chassis further comprises a third hole and a fourth hole, wherein when the attachment bracket is in the first position the first hole aligns with the third hole to allow the fastener to be received through the third hole into the first hole, and wherein when the attachment bracket is in the second position the second hole aligns with the fourth hole to allow the fastener to be received through the fourth hole into the second hole.