Like everyone else I too went with some of the cheapest ones I could find on eBay. All of my sockets were "921" style, so I bought LEDs with the same 921 base.
Like TC mentioned, although they will fit into the socket in either direction, only one is right. The bulb will only light up when the bulb is in the right way. Plug it in, turn it on. If no light, pull it out and flip it over.
Bear in mind: there are valid reports of the cheaper bulbs causing radio interference. The more expensive bulbs will have circuitry that will suppress noise from the bulb. I never ran into this problem; the cheapie bulbs work for me. But, this is an item where you probably get what you pay for.
The more expensive bulbs will have better quality LED chips, probably run cooler, probably have the noise suppression stuff, etc.
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2016 Greyhawk 31FK
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