4Pcs Transmission Filter 71943 Compatible with Hydro Gear 71943 Compatible with Scag HG71943 Compatible with Gravely 21548300 Compatible with Ferris 5101987X2(YP) ZT-5400 Series Trans Axles. Compatible with Ferris Most F210Z F320Z IS2100Z IS3200Z Zero-turn Mowers with ZT540 Transaxle Assemblies.