The dome light housing is safe to pop off and on. Just grab it with your fingers and squeeze from the front and pull down. It's snap fitted. The lenses in the sun visors maybe be old and could snap the plastic clips. I've done it to mine when changing the bulbs...but if your careful you could save it. There's a small slot that you can fit a flathead in to pry it out. Even if the bottom snap clip breaks off you can still put it back fine...it's a tight enough fit that with normal use can stay inside the housing.
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