Legal advice wanted on recent car purchase

[Goat Blower]

Sorry, but you don't have any recourse, it's a used car and even if you did bring it to court, you'd be looking at more time and money than what you're looking for. The court would simply say that you should've double checked to see that the part was on there. I'd even take $350 from him and call it a day. You can buy a used link for about that much and you're good to go. It looks like a nice car overall, you shouldn't have any problem getting your money out of it.