Abstract: An attachment (10) for use with an agricultural seeder implement is disclosed. The attachment (10) includes a pair of depth gauge wheels (28) which are aligned with respect to the direction of the intended movement (38) of the implement. The wheels (28) are generally parallel to a pair of furrow disks (12) which are aligned and have forward edges (32) thereof converging. The wheels (28) are disposed for horizontal movement forwardly and rearwardly with respect to the disks (12) in order to afford adjustment of lateral spacing (60, 62) between the disks (12) and wheels (28).