Name: Jacky
Channel series: S380
Channel length: 21
Channel stamp: 20 5
Quantity: 2
Hey Jacky. If you need an S380-21, then this is actually one of our stock items that you can order directly through our website. Our stamp option of 2050 can replace your old stamp code of 20-5; they denote the same spring strength. Let me know if you have further questions.