I did my best to model the Moko functional Apple Watch connector and added it to the CAD. You may have to make minor adjustments in order to overmold it into the bands. Additionally, we could not find 38 mm connectors from Moko - but as you can see in the image below (as well as in the CAD) the 42 mm connectors can be easily modified by grinding or machining to fit into the 38 mm bands.