are you refering to harnesses??
you should recieve eyelets with the harnesses,
in the back they screw in where the rear seatbelt clip went, and where lower end of the rear seatbelt bolted to the car
in the front you can take the bolt out of the pretensioner to remove that a screw in an eyelet in its place, and finally at the bottom of the B-piller there is a hole that originally secured the lower end of the front seatbelt to the car, that is where final eyelet will go!!
if you're using aftermarket seats you may have to bolt one of the eyelets through the floor with a spreader plate,
and if you wish to keep the rear seats or all the original seatbelts, you may need to get a little more creative!! lol