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8187 GM K20 Truck 8191 K20 Suburban Load Sensing Proportioning Valve Arm Mount GM Drivetrain & Axle This plate is for 12"x81 87 GM K20 Truck 81 91 K20 Suburban Load Sensing Proportioning Valve Arm Mount Please look closely at pictures to verify if this item meets your expectations. Our Business hours are Monday Friday 7am to 4pm eastern time, if you message after hours or over weekend or holidays we will respond as soon as we return to the shop. This is the load sensing proportioning valve used on the 81 87 K20 C20 trucks and the 81 91 Suburban that used the 9. 5" semi