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That will depend on what side you want the bullet loops on. The "right" sided models will place the bullet loops on the right side of the stock while the "left" sided models will place the bullet loops on the left side of the stock.
I beg to differ with both previous answers; their answers are correct for most cheekrests but not this product. I received two of these "right" cheekrests and both have the pad on the right side and the pouch/bullet holders on the left when installed - opposite of what acright-handed shooter needs. Look at the pictures for their "left" products: Yes it's upside down but orient it properly and the cheek pad will be on the left side of the stock, the pouch/bullet holders on the right... which is how it should be for a right-hand shooter. Their description is exactly opposite of my other cheekrests' descriptions so beware of these... it might be why OP is clearing out some with their "final sale" notice.
You want a right hand pouch. Smooth side towards your cheek, and shell holder on opposite side. The pictures are upsdie down and backwards, so read the description carefully and pick "right hand" side!