This is the ankle strap that fits on all FRx, FR1, FR2, FR3 and FR Spin skates. It comes in 2 different sizes, but the sizes only indicate the length. So any size strap is able to be mounted on any size skate.

ANKLE BUCKLES
These type of buckles or straps all have only one hole on both sides. They only vary in length. As long as the length will work, you can use any brand buckle on any brand boot.

Buckles that are mounted like this are called SBM2 which stands forStandardBuckleMountwith a total of2bolts.