Steering wheel boss / hub kit required to safely fit all our sports steering wheels to your vehicle. retains centre horn push for cars with this feature. now available for most vehicles including airbag equipped cars. this boss /hub kit is collapsible and multi-holed to fit the following makes of steering wheels - momo, nardi, raid, dino, autostyle, sparco, omp, bbs, racing, nova, mountney, ital volanti, sport line, simoni and isotta. it should be noted that you, as the end user, assume all risks when fitting, modifying or adapting these hub kits to your vehicle and that by fitting this product you may invalidate your insurance or warranty.