Our chromoly single boot flanges we offer have a 3/8 tall flange lip height. If you use the wrong boot with the wrong flange the axle boot will constantly peel off of the flange no matter how tight you make the clamp. The axle boots are sold separately and only sell the correct boots for these flanges. However we can supply the others on request if required.
Note: that it is common for axles to make contact with the 1/2 tall and other flanges thats why we no longer stock them.