SuperPro - Front Wishbone Bush Kit - Double Offset - GR86, GT86 & BRZ - SPF3878KGR86, GT86 & BRZ Front Wishbone Bush Kit Double Offset Increase Caster 4 Bushes in the kit Fensport Tip: SuperPro's GT86 Front Wishbone Bush Kit offers a double offset adding +1 degree of caster. Increasing caster has 2 benefits, increased steering feel and improved dynamic camber. Dynamic camber is when you turn in to a corner the actual negative camber will increase, improving tyre contact and providing more grip. SuperPro bushes offer the