My OEM Kangols had a clip type mount that attached to a loop formed onto the end of the retaining bolt. I simply unscrewed those bolts and fitted new bolts that the kit came with as they are the same size threads as standard seat belt bracket bolts. The new bolts pass through the hole in the metal end piece of the seatbelts. Long story short, simply unbolt your old ones and rebolt in new using brand new hardware, you should avoid reusing fasteners on safety related items. The rear seat will need to lift out to do those but the front seats you can leave in place and lift carpets to access your mounting plates or holes.