Does anyone know where to get replacement DU bearings, Walker part number 7201-3, for the idler pulley pivots on top of the jackshaft on a Walker mower. The dealer wants $12.00 each and you need four to replace all of the bearings. They are 19mm od and 17mm id. The dealer said that the older style bushings were cheaper as the new style has teflon inside the bearing. I cannot seem to find anyone on the web who can supply them. I hate to spend top dollar for something that someone else makes for Walker and the dealer just marks up.