get a parts house 8 blader (non AC) & you will be fine. cut an anticav plate on it if desired. I cut one out of the side of an old washing machine. cut the OD slightly less than the OD of the blade tips so you can tack several of em and drill a center hole & tack it there too. concentrate on a good 3 row and an MP clutch fan with 7 blades properly postitioned into a schroud with a 180 stat and proper pulley ratio. #1 need good airflow