You can simply tap a screwdriver into the outer glass (plastic actually) & pry it out. It's double layered so nothing gets in the motor. then use an appropriately sized socket to tap the new one in after cleaning up the hole. If you want extra sealing spread a little clear RTV silicone on the outer edge of the seal before tapping it in. I've done it a few times without any problems after watching the mechanic at the bmw shop do it this way.
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