Front Drum to Disc Brake HELP

Yeah thanks for the tip I called them earlier today but the guy was having trouble understanding the problem. That could very well be my fault if I was not explaining it correctly. He told me that none of their kits for 62-72 a-bodies can be converted to fit any of the later years because they are made to convert drums to disc. My problem is that my friend gave me a set of front disc spindles as part of the kit. I guess what I am asking is if the kit came with front Disc Brake Spindles for 62-72 a-bodies and the caliper bolt directly on to the spindle. If I buy a set of 73 and later Disc Brake Spindles are the holes the same size that way I can bolt on the calipers and use the kit. I know that the holes for the upper and lower ball joints are different sizes on the 73 and later spindles that’s why I can’t use the spindles that came with the kit. Does anyone know if the holes for where the calipers bolt on are the same for the 62-72 and the 73-76 and if so will the spindle swap allow me to use the kit?