This Motor Solenoid works with ALL Meyer plow pumps, and numerous other brands. It includes 2 mounting screws. Works with ALL Meyer hydraulic units except E-73 and Home Plow. Click on Related Products tab for OEM version. Sometimes we have single small post, and sometimes we hae to substitute the one with 2 small posts marked S and I. The small white triggerwire goes to the S terminal, and the I terminal must be grounded.