These instructions came with the kit to install seatbelts in a 1958 to 1960 Thunderbird.
Close-up of seatbelt end inserted into sister-hook which is then clipped onto eyebolt
Close-up of installing instructions for seatbelts, including looping of seatbelt into sister hook.
Original seatbelts in a 1958 Thunderbird with the rarely seen cloth interior.
Close-up of the original seatbelts. Note the rounded buckles. the seatbelt is worn by threading the cloth strap inside the metal buckle.
It is not a metal to metal connection as in later seatbelts.
Thanks to Richard Johnson for finding these rare instructions and taking the photos.