No one can really answer this for you but yourself. See it depends on how high your sight is mounted, which stock shim you are using and how you hold the gun. Different people hold the recoil pad higher or lower on the shoulder, some choke up on the stock comb with their face, others stay further back. All these things will effect your sight line to the sight. Cut you some strips of cardboard 1 inch wide and stack them up like a block. Hold it between the stock comb and your cheek. Keep adding cardboard till you feel your eye is lining up correctly with the sight. Then measure the thickness of the cardboard and buy the cheek pad that comes closest to that thickness. Before you do this though you may want to try different stock shims that will reduce the drop at comb. May reduce the thickness or possibly eliminate the need for a cheek pad all together.