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The starter I received is a terribly designed product. It goes into the fixture fine. However, buyer beware when we you need to take it out the white plastic casing can slip right off and then it’s very stuck in the socket. There are no brackets at the back of the casing to keep the it on. Other versions I’ve seen have the casing wrap around to the back end with four tabs. I had to disassemble the whole light yo get it out because there is no way to grab it and pull once the casing falls off.