if you know the manufacturer of the shelving, you can contact them and they most likely have shelving choices you can purchase.

if you wish to make them, jsut get wood in simplar dimension to your existing shelves, but wider for your needs.

sand edges to prevent scratching.

its pretty easy .. just cut them same thickness, length, and the width you desire.

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There are two ways to do any job. The right way and the wrong way. Do it right everytime.

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http://flooringworld.org

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You can buy a pice of melemine and cut to size and uses a iron to aply glued edge tape file and light sand edges as per manuf directions All thing should be sold a local home center

Good luck