These lightbulbs look like they were dropped in the sand by a child. The width of the base (the part that actually fits into the socket in a typical application) not only varies from lamp to lamp, but is also wider than the socket itself. So they literally don't fit. Out of ten lightbulbs I had to throw out all ten. I went to my local auto parts store and bought 2 packs of #74 bulbs and they fit perfectly. So I'm pretty sure it's not user error, just a lack of quality control.
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