The holes are located on the bottom part of the chair frame as shown in Pic. 1

Place tape measure in the middle of the strap. If it measures between 1 1/4” to 1 1/2”, order 1 1/2” strap. If it measures between 1 3/4” to 2”, order 2” strap. As shown in Pic. 2

Place tape measure at the center of the bottom hole on the left side of the frame, wrap the tape around the frame twice and across to the outside part of the frame to the right side (without wrapping the frame) as shown in Pic. 3 and 4