but do the wheels need to be?
Most sites list one wheel size when you search for an s2000.

So I go 17" can I use 17X8 front and rear? With same diameter as stock
height.

 

It would depend on the offset of the wheel and the size of the tire you would choose.

 

What if i used 17x8-50 both front and back but if i put 215/245 or 225/255

 

You should be alright with those sizes. I'm gonna go with 17x9's all the way around and +63 or +54 offset. Some day when I can afford the BBK and wider front fenders I want, I'll get two 17x9 +35 or +40 wheels for the front.

 

With those wheels I would suggest the 215/45R17 front and 245/40R17 rear.