Everybody probably already knows this, but just in case: NAPA (www.napaonline.com) has a part cross-reference section (PartPRO SE - located on the home page) that allows the user to cross-reference part numbers. On my T133S, the Thomas number for the hydraulic filter cross references to a NAPA # after I clicked the "Interchange" option under "Search". Also the Kubota part numbers for the oil, fuel and air filters cross reference - just be sure to NOT put any hyphens, spaces or anything in the Kubota # - just one long part number. Finally, make sure to haggle over the price with NAPA (i.e. "Is this your best price on this part?") because NAPA has some pretty highly-tiered pricing for the uninitiated. I'd be curious if everybody already knows this? And, if there are other good cross-reference resources?