These centering rings drop into the bottom of our Versa Strut or MaXX strut tubes to help center the “shock insert” in the bottom of the tube. Unlike the stock strut tube, most lowering tubes don’t neck down at the bottom to hold the insert securely. These rings are specifically designed for use with the unusual shape of the KYB Excell-G insert. Use with Top Line Versa Struts, or with any copy of the Top Line strut that uses a 2″ diameter tube. Pair.