I am replacing the ball joints on my sons 69 C 10. The truck came with the front converted to 5stud and discs. I am fitting the joints spec'd for a 69 but they do not fit through the upright enough to get the split pin in the nut, by about 3/8". Does any one know if the uprights are different thicknesses, where the joints go, for drum and disc setups. Or are the joints different for drum and disc. I'm from the UK so you may not use the same terms, sorry.