1.Compatible with: This air filter set is compatible with 4stroke engines FR651V, FR691V, FR730V, FS481V, FS541V, FS600V, FS651V, FS691V, FS730V. It also fits for 490657007 and 490650721 oil filters and 110130752, 110137047 and 110130726 air filters. 2.Professional air filter: In addition, this air filter set is suitable for 110137049 and 999990384, MIU12554 and MIU12555, Gravely 21548000, and it is designed to fit for FasTrak series lawn mowers with 106.7 cm, 121.9 cm, 132.1 cm, 137.2 cm and 152.4 cm decks. 3.Lawn mower parts: This air filter tuneup kit is an essential maintenance set for FR and FS series engines. It is compatible with the lawn mowers of the X300, X500 and ZTrak series, TimeCutter SS 5000, SS 5060 and MX 5060 as well as lawn mowers with Gravely Turn. 4.Excellent workmanship: Precision manufactured and tested for quality, the air filter set is made of highquality material to ensure durability and reliability. It is perfectly fitted and easy to install, provides a complete set to meet your maintenance needs.