Shelves for IKEA Bookcase (Brunswick BN3)

Hi - I am looking for a couple of shelves (max. 3) for an IKEA 'BESTÅ' bookcase which I was recently gifted by another Freegler. The dimensions are 16 x 61x 2 cm - if you have any of the little fittings that they sit on those would be dead useful too! Thank you. D