Seat strap


I’ve got 2 questions concerning length and width of seat strap:

-          Concerning the length of 14997400 and 14997300, is it the total length with the fixing system or only the length of the seat strap ?


-          Concerning the width of 14997300, is it the width of seat strap or the width of the fixing system because it’s indicated 30mm ? For me it’s large