LG Dishwasher Upper Wheel Assembly. Part 4581DD3002A
 
Wheel is 27mm high, 12mm channel width, 15mm outside.
Bracket is 19mm tall, would have to latch onto basket of 5mm diameter.
 
Suits LG Dishwasher Models LD-1204M1, LD-1204W, LD-1204W1, LD-14AW3, LD-14NI, LD-2120W, LD-4120M