I am looking at your DFRobot 65mm Rubber Wheel Pair - Blue, it says that the hubs are sold separately, the picture shows hubs for the TT type motors, but I cannot find them anywhere on your site, so where can I get them?
Hi there @DWV and welcome to the forum
I guess you are referring to this:
https://www.dfrobot.com/product-645.html
It looks like it was discontinued.
A good option would be getting the part printed, here are the dimensions:
I hope that can help you out