Winch wire gauge query

What’s up everyone?! Just a quick question about my winch. Having a little trouble navigating the site, (damn newbie), so I apologize if I’m out of line here in this forum topic…
picked up an o6 kodiak 450, love it, and grabbed a used warn 2500 winch. I believe it’s the 2.5ci…? I plan on putting the solenoid under the seat to keep it dry and hopefully safe, and the wiring that came with it is too short. I can’t read the gauge size off of it, so if anyone can help out that would be great. the blue and yellow are larger than the red and black…not sure why that is, but I have some #8 lying around and was thinking I could use that for all the wiring…? Unless the wires that run to the winch have to be larger in order to handle the amperage load…? Any advice/info would be great! Thanks in advance!
Ackack