My Directions also said 10.25, thinking that was going to be the perfect set up I did some welding so I could put some weight on the coils and axle. Long story short I should've done 10.75. I had to not put on that 1/2 thick jam nut on the heim and ended up welding on a small diameter tube perpendicular to the end of the arm, cut a slit in it, put a bolt through it and have a pinch joint on the end of the arm to keep it tight on the heim. Works perfect and is clean(there is a pic on page 2 of my gallery) don't know if that will be and option for you since your stuff is already powdercoated.