GKTECH 86 / GR86 / BRZ Front Caster Bush Spherical Replacement (pair) (Order in)*NOTE* Currently is an order in product from GKTECH In Australia. Takes roughly 3 4 weeks Listing is for: 1x Pair of Spherical bearing The GKTECH 86 GR86 BRZ Front caster bush spherical replacements are designed to replace the factory OEM rubber bushing on the caster arm. OEM rubber bushings are designed to absorb road noise but that comes at the cost of performance. It's common for upgrades to be made of a harder rubber or a polyurethane but rather