I have two of these Premier Lokfast Mounting Brackets, from about 1981, which are new old stock and to my knowledge have never been mounted to a drum.
The diamond chromework and precision alloy castings (Mazak) are in perfect condition.
Grade A - Diamond Chrome plating is perfect
Screw Spacing - 59mm
Hole Diameter - 11.3 mm
Complete units, fully functional.
£37.50 each (+ shipping £3.95)