Blue wire connected to Seat belt

I need to replace my seat belt but im not sure how to remove the blue wire connected to the seatbelt without damaging it. Anyone knows how?
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What year car is this? I think that is actually a cable that retracts the seatbelt when the door is closed. It goes to the plunger in the door jamb. You can remove the button/plunger and remove the seatbelt assembly with the cable and the plunger attached. Here is a picture of one out of a car for reference.

seatbelt.jpg
 
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