There are two different sets of templates and feet.
1/2 inch templates work with the 1/2 inch Ruler Foot
1/4 inch Mini templates work with the 1/4 inch Mini Ruler Foot
There are three different Ruler Feet for both the 1/2 inch and 1/4 inch templates sizes, depending what machine you have. When your presser foot is in the down position measure from the screw hole to the needle plate. That measurement will determine whether you need a low, mid or high shank foot.