This retrofit column is designed to fit your 1958 Impala and does NOT require modification to your original vehicle to install. Simply remove your old column, saving your original under dash mount and floor mount. Use an ididit installation kit to install your new steering column in place of the old. Add an aftermarket wheel (using an adaptor) or original wheel but keep in mind that an aftermarket wheel may push the wheel closer to the driver and the original wheel will increase the overall length of the column towards the driver.
