Hydraulic Throw out Bearing - Bolt On MC1304Hydraulic Throw out Bearing Bolt OnSuit Ford Toploader 3 & 4 Speed with 1 1 16 x 10 Spline MC1304 1304 Bolt on hydraulic throw out bearings are used with bellhousings less than 6. 5" deep or where the measurement from the outside rear of the bell housing to the clutch fingers is less than 3". Bellhousings deeper than 6. 5" should use the slip on style bearing.