I am looking for the correct mandrel assembly number for this model number. The repair parts catalog shows the numbers for the individual components (housing, spindel, bearing, etc), but I am having issues finding the assembly number to order. I believe the current mandrel assembly number is 587819701, which I believe replaces 532192870. During the process of ordering, it asks to verify the correct part by entering the model, which I did. However, it cannot locate the model number. Could someone please advise?