3157 (3157A, 3357, 3457, 3757, 4057, 4157)

3157 halogen bulbs are dual filament bulbs.  They're available in clear and amber painted glass. 3157 LEDs provide similar setup with dual LED brightness and dual colors.  3157 LED bulbs are available in white/white, amber/amber, and white/amber color combinations. 

All 3157 bulbs are made to fit a standard 3157 socket NOT a CK socket, except for the new CB6 LEDs. To adjust a STANDARD socket to CK, simply rotate the wires counter clockwise by 1 position. By doing so you will match the wire assignment in  a STANDARD socket to the CK bulb. You'll have to either re-pin the socket or cut and splice the wires.