Heated seat question.

So I have a 2004. Bought leather seats out of a wrecked 2008. Come to see that they’re heated. Switch on side. Each seat has a relay and wiring under it. One red one ground. Passenger side has a second plug on its power wire. So just gonna daisy chain them and run it to a acc in fuse panel. My questions.
1. Wiring seems kinda thin for power. Just keep it same size going to fuse panel? Go bigger ?
2. What size fuse ?

 

Relay and wiring have a big authentic Toyota sticker on them both