I think you can use the same as for the 502X:
51320 DB01 White Dish Wheels (Front/White)
51321 DB01 White Dish Wheels (Rear/White)
51304 DB01 Black Dish Wheels (Front)
51305 DB01 Black Dish Wheels (Rear)
53985 TRF501X Front Dish Wheel (Yellow/2pcs.)
53986 TRF501X Rear Dish Wheel (Yellow/2pcs.)
54282 DB01 Front Dish Wheels (Pink)
54280 DN-01 Rear Dish Wheels (Pink)
And yes, the front wheels has a hex.
Best regards
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