Since January the new SHARKY backrests for size 1 and size 2 are available. Size 1 for back height 35 cm and for back height 45 cm (item number: 3401-260X). Size 2 for back height 45 cm and for back height 55 cm (item number: 3402-260X).Also available since January 2023 is the newly developed backrest extension for SHARKY size 1 and size 2 (item number: 3401-2380).