Single seat: 90-140 cm
Double seat: 145-185 cm
Three seat: 190-230 cm
Quadruple seat: 235-300 cm

There is a measurement guide below

 Measure the distance between AA and BB and select the correct option.

For example, if the length of the A-A is 160 cm and the length of the B-B is 210 cm, please select the option 145-190 cm 195-230 cm.