At least in my case. Only two out of four worked. These may have been poorly formed sockets/threads - they went in with significant screwing resistance. There are no obvious thread breaks. It's not even $5.50 for two, but the inconvenience of taking apart lights to replace old ones. I would look for another seller. Zero stars if I could. Compared to the long-lived old bulbs, they looked the same except they had a micrometer on them. Off-center, as others have pointed out, just didn't work.
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