Case CX36b mini excavators have some optional undercarriage parts depending on your serial number. If your CX36b was originally equipped with steel tracks then your sprockets, rollers and idlers need to be verified by part number or dimension. Please read the product descriptions closely to verify you receive the correct sprockets and idlers for your specific model. Buy aftermarket replacement rubber tracks, drive sprockets (PX51D01001P1), top carrier rollers (PW64D01017F1), and bottom track rollers (PX64D00009F1) for Case CX 36B mini excavators. Browse our Case parts catalog online for more details and call us if you have any questions. Rubber track tread patterns may vary so please specify if your track tread pattern is critical for your machine.