Replacement Parts For Truck Roller Bottom Roller RD441-21702 for Kubota KX057 U55 KX057-4 U55-4 U48-3 Details Description: This is the aftermarket replacement bottom roller for Kubota KX 161-3, Kubota U-45-3, and Kubota U 40-3 mini excavators. This roller is also designed to fit the newer Kubota KX 057-4 and U55-4 mini excavator as well. It is highly suggested to replace all the rollers on one side as opposed to just replacing one roller at a time. One new roller installed next to worn rollers will put uneven weight distribution on the new roller limiting the lifespan of the new roller. These rollers come as a complete assembly and you can reuse your factory bolts for easy installation. If you are in doubt, please send us message. Part Numbers: RD411-21702, RD411-21703, RD441-21702 Fits For: This roller is guaranteed to fit the following models: Kubota KX 161-3 Kubota KX 161-3SS Kubota KX 057-4 Kubota U40-3 Kubota U45 Kubota U45-3 Kubota U48-3 Kubota U55-4 Kubota dealer Alternate Model: The RD411-21700 roller is known to fit the Kubota U45, U45-3, U55-4, U48-3, and U40-3 models in addition to the KX161-3. This is not guaranteed for the Super Series models. You must verify measurements if you have a SS.This is not guaranteed for the Super Series models. You must verify measurements if you have a SS.We now stock the steel track version of these rollers so please indicate if you are running steel tracks on your mini excavator. Package Includes: 1x