Rogers Ultra-Matic Bi-Directional Tom / Bass Mounting Bracket
This is the bracket you're looking for.
Mounts to toms, floor toms, and bass drums and is compatible with both new and vintage Rogers Drums; This bracket will retrofit nearly all vintage swiv-o-matic tom holders, bass mounts, and spurs.
Hex rod can be inserted vertically or horizontally into the bracket. Fits standard 3/8" hex rods as well as round 3/8" (9.5mm) knurled rods. Fits the standard Rogers 3-1/8" x 2" mounting hole spacing.