1960 Chevy Impala Sedan/Wagon 2-Speed Wiper Transmission Arms PAIR PRIMED. Impala, Bel Air, Biscayne, El Camino.These 1960 Chevy Impala Sedan/Wagon 2-Speed Wiper Transmission Arms GM parts #4904503, 4904505 that have been media blasted and primed. They have been inspected to ensure proper movement. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts & Accessories\Engines & Engine Parts\Engine Mounts". The seller is "southeastchevyparts" and is located in this country: US. This item can be shipped worldwide.