The cycle dial on my Aqualux 1200 has detatched from the label ?

My Electrolux Aqualux 1200 has a dial to set the cycle which turns, along with the outer dial which is attached and has labels on it telling me which cycle I'm setting it for- or, I should say, it used to be attached. I set it to wash my clothes but not dry them, but when the cycle finished, the dial seemed not to have moved. In fact, the dial was working, but I was able to spin the label ring independently. I managed to detatch the label ring and the plastic bit that holds it in place appears to have snapped off. I probably just need to order that plastic ring, but how do I figure out what the part number is? Can anybody help me?