Im trying to rebuild the center arbour on my sears "917.253540" 42 inch mower deck. The diagrams at sears parts direct show them to be, cone part # 9494H and cup part# 888R. But these parts are no longer avaliable, so a sutable sub. listed as #STD315656(cone) and #STD315666(cup) made by Hoover. After removing the center drive arbour from the deck and partal dis-assembly the top bearing is a Timken #LM12749.I have not removed the spindle from the unit so i do not yet have the cup # but upper and lower bearings and cups are listed as the same. Dose any one know if the Timken # is a sutable sub. for the outhers, or has someone attempted to replace the bearings with some that are close but not quite right. I want to get it right so as not to do this over in a few years. All help appricated. Robert D.