EC5 connectors come a part, I'm not sure about IC5.Maybe I'm missing some hidden trick to disassembling the IC5 but it doesn't looked like they come apart. They look somewhat similar to pics of the XT60 and XT90 plugs. Got a trough you lay the wire and solder in.
Kinda pricey, but I liked the ability to solder in that trough. And the 3s Granite BLX came with IC5 connectors and didn't want to attempt soldering a new connector on an ESC without a lot more experience
The EC5 push out towards the open back (wire end). There are a bunch of YT videos. Look for soldering EC5.