[Compatibility] 539102720 steering shock is compatible with BZ EZ MZ IZ Zero Turn model, Jonsered Z54R Z52XF Z52XF Z48F Z46R Z42F, PX46Z PPX46Z PP42SZ 541ZX 461ZX, RZT61x RZT54 RZT48x RZT48 RZT42 CZT61 CZT52, AYP lawn tractor or mower parts accessories. Replace 5391027-20 steering dampener shock damper gas damper motion control damper. Note: Pease check your damper model, lawn tractor or mower model to the compatibility. [Upgraded Shock-absorbing] Adopt upgraded shock-absorbing structure, which quickly absorbs and consumes machine vibration energy through more suitable components such as springs, dampers, and cushioning pads. Meet the factory quality standards, effectively reduce vibration sensation, and improve lawn tractor or mower efficiency. [High-quality Materials] Adopt pgraded and high-quality metal and plastic, which is resistant to high pressure and tension, and not easily damaged. We have tested tens of thousands of times and it runs well, more than the old version. [Easy to Install] Including 2 pack damper. Easy installation within a few minutes. Colour:Black Material:Metal+Plastic Package Contents: 2x Steering Damper Gas Dampe Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.