This is the same 3-bolt mounting flange as supplied on the Tilton Super Starter for FF1600 & F2000/S2000 (Part No. 1165-002). It mounts to the starter nose with one countersunk flat-head screw and two small Allen bolts.
The compact Tilton XLT starter (Part No. 1151) takes a different Formula Ford XLT Starter Mounting Flange, Part No. TE 54-530. The two styles are not interchangeable.
The body of the original Tilton Super Starter is black and measures 3 3/16" diameter. The body of the XLT starter is yellow plated and measures 2 3/4".