A sweep assembly for an agricultural tillage implement includes a sweep having a blade and a neck extending from the blade. The neck has a cavity configured to receive an adapter, the cavity is formed in part by a forward left contact surface, a forward right contact surface, a rearward left contact surface, and a rearward right contact surface, and the neck slopes laterally inwardly along a first direction extending from a top opening of the neck toward the blade. Furthermore, a left contact surface angle between the forward left contact surface and the rearward left contact surface is less than or equal to 60 degrees. In addition, a right contact surface angle between the forward right contact surface and the rearward right contact surface is less than or equal to 60 degrees.