Can't see any link to the wheels you have seen so I've no idea if they will fit or not. It is easy to find a wheel that physically fit on your car (have the right PCD and bore diameter etc) but beware of getting something with the wrong offset (ET) as it will alter the steering feel and handling, possibly not what you want.
Have you thought about getting second-hand steel wheels? I have megane 6 x 15 inch steels on. Cost me a tenner each. Lots of choice for 15 inch renault steels that will fit. mine are ET43 offset, your cup's wheels are ET38 but ET43 will work well too and still clear the brakes, which is an important consideration as I don't think all aftermarket 15 inch alloys will clear the brakes???