Measure the distance from slot to slot (B) on your furniture. This measurement determines wich strap (A) to choose.
(There is totally eleven vaious lengths to choose from)
ATT: Never measure on old straps.
Exampel: if distance B is within 502-526 mm (19,76-20,70 inches),
then strap No.445 (mm) will be the best choice.
If you end up betwen two straps, choose the shorter one.
Strap No. 445 in the example is exactly 445 mm (17,52 inch) long
and will be streched out appr 5 cm (1,97 inch) when you mount them.