The wheels on my S3 don't seem to me to be split rims so yours may be different (even though they look the same!)
On mine it's just an alloy wheel with a stainless rim. Perhaps these can be extracted and replaced... which may ne what you're getting at. Good luck. I don't know what they did with my wheel but it looked a right mess before and looks great now so perhaps the whole stainless rim was replaced.
Hi - yes the wheels on the S3 do look the same.... perhaps I'm mistaken about them being split rims. Who repaired yours?