Part Number Cross Reference Guide. 5C1644, E1057, 52-1881, 4606824AB, 4606824AC, IC637, UF-557, C1587, UF557, GN10346, 521881. All custom orders Seats, Shocks etc. Tracking numbers are updated manually, so please allow enough time for your information to be entered after your order has been placed. We are not responsible for install mistakes.The RA # must be on the outside of each package with the RA # in a visible area. Any package without the RA # will be refused. This item is in the category "Automotive\Parts & Accessories\Car & Truck Parts & Accessories\Ignition Systems & Components\Ignition Coils". The seller is "npboostedcanada" and is located in this country: CA. This item can be shipped worldwide.