Do you mean the gland nut? And is this for installation into an AE86 or similar?
If so, the gland nuts that come with KYB AGX SW20 shocks have the wrong thread for AE86/xA6x etc. You can reuse your exisiting gland nuts, or get hold of some KYB ones to suit your car (this option guarantees that the damper will be centred)
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