Spur central diff part with indentation

I'm moving all my files to printables.com. This model is now available here: https://www.printables.com/model/161419-spur-central-diff-part-with-indentation

I could not get the original central spur to fit because of the ring on the metal gear. This variation has a slight indentation at the bottom (6.8mm * 0.5mm) for a better fit.