Matt,
The back of the housing pops off. On each side of the housing, you will see plastic extension clips protuding, aimed to the rear. Gently lift up on these clips on at a time and pull back on the rear of the housing. It should pop free. Be careful, the plastic is old and brittle.

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.