fitted/torque up sliders and noticed gap between inside face of slider to swingarm face. removed them and compared profiles to the originals and found old ones have a chamfered inside edge to clear a small radius on swingarm casting. eventually filed (which doesn't compromise the look) a chamfered edge on new sliders to clear radius until they sat flush against swingarm face. retorque, check ok. design and finish of product can't fault maybe
DRIVEN might have to further investigate.