These 4-way connectors were made for Mattel Pixar Cars track sets. There are two different models included here. One of them has the New (2023+) smaller track set connectors on all 4 sides. The other model has 2 adjacent sides with the New connectors and 2 adjacent sides with the Older connectors.

This should allow you to connect all your track sets together, no matter when you bought them. These were made by me, based on measurements taken from track sets that we own.

I print these bottom-side-down with slim tree supports enabled. You can see some of the bridging on the under-side of the model but it doesn't compromise the strength or functionality.