First - Identify your Coil - (then scroll down)
You should also measure the depth of the coil - The distance from front to back will determine emitter bulb length.
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If your AC coil looks like this >>
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Type N Coil
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You need a 1 Hole Fixture
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If your AC coil looks like this >>
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Type A (aka V) Coil
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You need a 2 Hole Fixture
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UVC Fixtures
First determine which type of fixture you need from the guide above.
If you need a 1 Hole Fixture
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If you need a 2 Hole Fixture
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Replacement Emitter Bulbs
Bulbs should be repaced once every year. They slide in very easily after removing the fixture's cover plate.
If you need 1 bulb for your unit
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If you need 2 bulbs for your unit
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