Most snails are universal... But just measure to be sure. I personally dig the snail with a step down which can be removed to run 3 1/2 to gain a bit more flow. Some snails are double drilled or drilled at an offset to put snails either in or out of vertical. I believe there is only one style of gasket as well. When you get logs..get a pair that are offset to match heads. This will keep your snails at the same placement.