Complete Water Pump & Seal Kit for MerCruiser R/MR/Alpha One water pumps. OEM: MercuryReplaces: Mercury GLM Kit 39890For 1978-91 R/MR/Alpha One water pumps.also crosses with:GLM: 88020Complete Water Pump & Seal KitSKU: 26-01800-mr$85.00PriceQuantity*Add to Cart