An adjustment assembly for adjustably coupling a first structural member to a second structural member is provided. The adjustment assembly includes a clamping member adapted to engage a portion of the first structural member and at least one fastener adapted to pass through the clamping member and the first and second structural members. The fastener is moved into a first position to fixedly couple the first structural member to the second structural member, and the fastener is moved into a second position to adjustably couple the first structural member to the second structural member.