1951 Mercury 12V Wiper Motor Kit w/ Shaft Extension Compare. Direct Bolt in 1951 Mercury Car 12v Two Speed Electric Wiper Kit. Self parking motor bolts direct to factory wiper mechanism. Shoebox Central Includes the shaft extension you need to retain the factory bezel nut and knob at no extra charge! Other suppliers do not do this without charging you more.It Also Applies To New Unopened Uninstalled Parts. The item "1951 Mercury 12V Wiper Motor Kit with Shaft Extension Compare" is in sale since Friday, October 6, 2017. This item is in the category "eBay Motors\Parts & Accessories\Vintage Car & Truck Parts\Exterior\Windshield Wiper Systems". The seller is "shoebox-central4953" and is located in Oklahoma City, Oklahoma. This item can be shipped worldwide.