Filters manufactured before 3/1/93 contain a different band assy. (item 12). The correct P/N for these units is 181012. Filters manufactured before 9/1/92 contain a different non-spring design. Clamp components such as nuts, washers or bolts are no longer available for these non-spring design clamps. Do not attempt to interchange components between spring design and non-spring design clamps. |