Rubber mounting feet for the Trion 707 series center pan. The Trion-23 rubber measures 1 x ½ x 3/8" and has an offset.Four feet are spaced evenly under the plastic center pan TRI-35. Our price is for a package of four (4) rubber feet.These feet need to be glued to the underside of the plastic center pan. Glue Not included, we found super glue works very well. See the instructions for installing the impeller with a 1/16" gap: Trion Impeller Installation (1 page, 70k pdf).