Replying to Help with mounting my FKS's....

So I broke my dukes so my FKS's are going back on the pow skis. The holes are already drilled for the FKS's and I already took out the plugs....when I try to crank down the screws the the toe piece feels loose.  When I took the FKS's off I noticed a 2mm plate and cant figure out if it goes on the toe or heel (it only appears to be able to go on the toe) Do I need this..? and I went down a boot size since using the FKS's can I adjust them by turning the screws on the bars on the heel...thanks for the help...