I have a B7800 and like to change fluids and filters regularly. But the cost of Kubota filters and fluids are expensive. Has anyone ever used Wix or Fram filters and if so do you have the comparable numbers? I have used a Wix 51334 oil filter without a problem. I had found that a Wix 51551 is supposed to work for the hydraulic oil filter but have not tried it yet. And I have found no numbers for the HSD filter in a Wix or Fram.