tried to fit new heating element to white knight tumble dryer?

bought new element for white knight dual tumble dryer
when trying to fit the element was found to b too big by 1/2 inch if placed in brackets it doesnt stay an when machine turned on the element expandes and rubs at the drum foned company who i bought it off to b told that they are all the same size [dont think so] its a white knight dual heat tumble dryer modile no CL411GR