seat belts
#1
#2
Usually, it's nothing more than unbolting the old and bolting in the new. You might need a big Torx70 socket or something but should be pretty straight forward. At least these are easier then an Audi I used to own. The seat belt had a cable that went forward under the door, through the firewall and attached to the engine. The theory was if the engine moved backwards in an accident the cable would tighten the seat belt faster then your momentum would. Great theory but replacements were $400 for parts, $500 in labor.