The Front Bumper - Vaypor 2023 is a replacement item suitable only for the Vaypor 2023.
Use a small amount of acetone or nail polish remover to dissolve any glue from the base of the shoe. Try, as best as possible, to apply the acetone right where it is needed. If necessary, pry the toe guards off the sole slightly to apply the acetone onto the underside.
Each kit contains left and right bumpers and can be installed on the models above using Loctite 401 or equivalent.