Saddle (seat) cushion springs set of 21 (fits under cover for support). 10 long springs (140mm body; 180 mm incl hooks) + 4 medium springs (120mm body; 160 mm incl hooks)+ 7 short springs (40mm body; 80 mm incl hooks). NOTE: You do not require a spring in every hole. Usually long ones are fitted on the outside with medium ones on the inside
