FC3S Fitment
 

So I'm kinda stuck in the new member so I'm forced to post this here. I just bought front 25mm fender and rear 30mm fenders for my FC and I'm just wondering what size wheel would fit good. It is a 4 lug car so for now I'm gonna be sticking with 4 lug wheels till I find 5 lug subframes. I just wanna know what size would fit well I wanna run a 17 or 18 and am just wondering what offset and width I would need, thanks!

It's probably a good thing you're "stuck" in the new member section as the question of wheel fitment gets asked ad nauseum and you'd likely get some answers you wouldn't like much.
Go thru the stickys, do some searching in "Wheels, Tires, Suspension" section and talk with a wheel shop once you have these fender flares mounted. You can't expect others...nor would you want to rely on others thru a forum, to figure out what fitment is correct for something as expensive as wheels on a modified car.
That said, this might help....
https://www.willtheyfit.com/