supply of air spring assembly [140kn] consisting of 6 items 1) air spring (rubber bellow) - 01 no.2) top interfacing plate with bolster with spigot- 1 no. 3) sealing o-rings - 2 no. 4) baseplate - 1 no. 5) emergency spring - 1 no. 6) high tensile hex socket head screws withspring washers - 4 sets specification: c - k509 [rev-2] amendment 2.