Kubota KX 121-3 KX 040-4

Upgrade your Kubota KX 121-3 series rubber tracks to the premium aftermarket rubber tracks from Rubbertrax and increase the lifespan and performance of your undercarriage. Some undercarriage components are interchangeable with other Kubota models, for instance, the top roller also fits the KX 161-3. The rubber track is dedicated to this undercarriage system and is not interchangeable with any other track. The steel track and hybrid rubber tracks are also available for the Kubota 121-3. We now supply the complete line of KX 121-3 series undercarriage parts including the drive sprocket (RD118-14433), the idler (RD118-21300), the top carrier roller (RD411-22900), and the bottom track rollers down the center of the undercarriage (RD118-21700). 

See the image below and use your mouse to explore the part numbers they should pop up with a link to the part number you need for your KX 121-3.