Ok, I picked up a 2.5w A3 laser, but of course now I want bigger...

Laser wattage is fine, I make wood signs. I'd like to be able to burn a sign up to say 30x60cm.
So I've found sources for longer rails & belts, but where do I get longer wires or extensions for the laser & motors? Are the connectors on them a standard, and if so, what size/name are they? I saw one post about wire extensions, but it didn't say what machine they had.