Fiat Punto Centre Cap For Alloys

Some thieving b*stard has stolen a centre cap from one of my alloys (think mini wheel trim). I know it didn't just come off as they are extremely hard to get off and then to make it worst when I removed one from another wheel so that I could get a match one of the clips broke, so I know need two new ones and Fiat want to charge £20 each, does anybody know if you can get aftermarket ones to fit?