Fits most Generac V-Twin 760 cc & 990 cc engines 12-18 kW air-cooled Generac, Centurion, Siemens & Eaton standbys IF YOU HAVE A GENERAC 999CC ENGINE THAT REQUIRES A CIRCULAR FILTER, PLEASE SEARCH FOR PART #0G5894. 0G5894 IS A TALL FILTER, 0C8127 IS THE SHORTER FILTER.