December 15, 2016 by Carter @ Zone Offroad 0 Ford, Ford Testimonials, TestimonialsTestimonial: Super Duty 6″ Radius Arm Kit I have an ’05 F350 dually I used your 6 inch lift with radius arms on. Its been 3 years now of flawless driving and perfect alignments, no signs of wear at all, this is just a big thank you. ford dually ford super duty fordtrucks testimonial zone radius arm 1/1