led dome lights

B-6 Bulb with single filament and two contacts.
Wagner Lighting catalog 2008.
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was there a suggestion to use an 1157? Surely that can't be right.
That's an S-8 dual filament bulb with an indexed base
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so i was unable to find an led version of the 1004 at my local auto parts store, but i did find the 1157 leds which are the turn signals. i but them in and they dont turn on until the lights are on. but then they dont blink and stay fully lit. i've heard this can be a common problem but is there a solution?