Wire gauge vs wire color

[Jstock85]

Gentlemen:
I'm cleaning up some wiring on 85 c10. I have a couple questions on wire color and wire gauge. I need to fix a fray on the alternator to battery wire. I double check the web and it's red 10 gauge. Go to oreilly and auto zone and red conntectors are 8g and yellow is 12-10g.

So what do I do...buy the red because the exsisting wire is red or get the yellow that says 10g??? Or have I screwed this up completely!! Any help is appreciated.

Thanks
Jeff
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