The Bobcat® T-64, T-66, and T-76 are all built on the same undercarriage platform. Most of the parts are interchangeable with only a few variations to the T-76 considering the track is longer for more footprint and less ground pressure.
There are serial breaks and there are optional style such as the solid mount versus the torsion, or suspension type undercarriage. The parts are not interchangeable across those two undercarriage styles so you must verify prior to ordering online.