I took the ampli-torc out of my 445 today and found it has the same thing the parts book shows. Part number 10R924A this is the one with the 8 rollers and springs. Took the one out of my parts tractor witch is a 445 also and the ampli-torc is different it has a whole bunch of small rollers that lock on to the hub and looks like there is a different bearing on the shaft that goes into the transmission. I did not get the serial numbers I will try to post them latter. Was the one with the small rollers an update over the one with only 8 rollers. I will be putting the one with the 8 rollers back in the machine. Just wondering what the difference is and what one was stronger?