Updated. The Z chains aren't great looking but work. There are 14 links on each side. Pictured fully extended and all the way down. 10mm clips on left, 7mm on right. The Z top connectors snap into the holes under the Z carriages. They're somewhat tight, but a screw and nut through the hole might be needed later.

This is a set of chains for X and Y. I used the links by junaling, but changed it to a snap-in retainer clip. It's still compatible with those links though.

It's easy to install (if you can find 2 screws to fit the X carriage, and 2 to fit the base, plus the 4 for the Z bottoms), but all parts except the clips were made using supports and brims because of the added slots for the clips, and for my poorly designed brackets, so it's a lot of work removing the excess plastic. The X chain uses the extra screw holes on top of the carriage, and the base connector uses the extra screw holes next to the cable, and faces the back. The first link off the bed is flipped so it holds the chain low. There's an extra link that's reversible which isn't used.

There are 19 links on X, and 14 on Y. The 10mm clip was used for X, and 7mm for Y. Just slide the bed all the way forward and back with the carriage all the way right to ensure it doesn't hit, or touch the bed leveling knob, and reaches the full range.

Edit: Z_topRight is actually the bottom swivel link for both sides.