With my Anet AM8 I was using the end piece from Anet A8 Y-Cable Chain underbed extended to connect to the Y carriage. I decided to upgrade my carriage to the upgraded version from Gulfcoast Robotics and that part no longer fit so I designed this part to fit into the new carriage.
The thinner piece (YChainHolderTop.stl) goes on top of the carriage with the protrusions fitting down into the carriage, the other piece goes under the carriage. Use long zip ties in the channels to hold them together.
This should work with most cable chain pieces - I use the pieces from Loose and Light Cable Chain for my cable chains.
Anet AM8 (heavily modified)
3D Solutech PLA
Print the pieces as they are in the STL - the larger piece will bridge just fine as long as you have decent part cooling, no need for supports.
This is designed for the cable chain to be to the right of the Y belt, if you want to put it on the left just mirror YChainHolderTop.stl. The other part is symmetrical so it works fine either way.