Hydraulic Throw out Bearing - Bolt On Suit Tremec 5 Speed MC1364Hydraulic Throw out Bearing Bolt On Suit Tremec 5 SpeedTKO500 600 & 3550,3550TKO with 1 1 16"x10 &1 1 8"x26 Spline MC1364 1364 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.