51446, 6853SE, 6855SE, KYBSS15489, M4000-265050-KYB, RS5410, SC2961, SS15489. Steering Damper. KYB Steering Stabilizers are designed to stop vibrations before they reach the driver. Steering Stabilizer.
When I bought my 2000 F250 this was missing. Installed this new one to help correct wandering steering. It didn't fix the problem, mine were alot worse. Now that the front end is all rebuilt it drives as good as it did when I bought it with the stabilizer missing.