This bone is in three pieces: The Centrum, the Neural Spine and one of the zygapophyses. The zygapophysis is not included in the 3D assembly but there is a 3D model of it. This is the 5th Caudal Vertebra. It is also Muffins first tail bone where the Neural spine is not fused to the centrum.
The 3D models and still .jpg measurement photos for these three pieces can be accessed from Zenodo:
The Centrum: https://zenodo.org/uploads/13261396
The Neural Spine: https://zenodo.org/uploads/13261300
The Zygapophysis: https://zenodo.org/uploads/13261248