Powerflex Front Wishbone Rear Bush Caster Offset PFF19-803GPFF19 803G is a CNC machined aluminium mount and polyurethane bush to provide 0. 6 degrees of positive caster offset for improved handling. Focus ST and RS owners are all too familiar with the commonly reported torque steer effect of their vehicles. Our new part providescaster offset to improve handling characteristics and has been proven and tested on road and track. PFF19 803G Front Wishbone Rear Bush Caster Offsetis aCNC machined Aluminium mount