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I think they're whatever I wrote above. They don't have the holes at the ends and having looked on the Shimano site don't actually mention internal Di2 routing. I've not even looked, I'd just left it with a shop while I was riding another event and now I'm broken I don't care to look yet.
hippy-
The carbon ones don’t have the holes at the bottom because the di2 wires go fully internally. It’s only alu ones that have holes because I think they have filler around the shifter clamping areas to make them stronger (probably also to make you buy the carbon ones)
I real easy way to check is to take a brake inner and run it through one end and it should come out the other, if it does you’re all set to go.
You need one wire from junction box A to the right shifter, one wire from the right shifter to the left and then one more super long one which will come out the bars from the left shifter to junction box B
b0n0rv2
What’s the actual bars you’ve got? All carbon PRO bars have been bar end compatible for a few years now