How to fit new type bearing kit?

The drum roller supports on my Indesit IS70C tumble dryer have worn and are rubbing against the side of the housing, I have been told that these rollers are no longer available and I have been supplied with a upgraded Bearing Kit (part c00118931) i am not sure how this new kit is fitted, i have asked indesit for instructions but they will not provide, could you please help!