Replacing the R&P on my 1979 due to faulty inner tie rods. I bought a replacement manual R&P from Rock Auto and looks fine, but discovered that the rag joint coupler needs a flat ground on the steering input shaft on the R&P and the replacement is perfectly round! Anyone seen this before? Not sure if I should grind a flat on shaft and use it or try to return it and find one that will work. For those of you who have replaced your manual R&P, where did you get yours from?