These Heavy Duty U-Joints are for a Austin Healey Sprite, MG TD, TF, MGA, MGB, MGC, MG Midget, Triumph Spitfire, GT6 and TR7. Each U-Joint is Cold Forged with the Lindberg Heat treating process, they have oversized Elliptical Shaped Bearings and each has a Lubri-Groove and a Grease fitting for long life