Custom made for TKM Performance by Advanced Sleeves in Ohio Coyote Dry Sleeves for Gen1/2/3/4 and GT350/GT500 5.2 Platform Machining is Required for Install, Bore and Final Hone is also required Includes 4 single flats and 4 dual flats Will work with 3.630-3.710 Bore Size with Final Machining 3.825 od 5.250 Length .200 Flange Thickness