How can you tell the difference between a 65-66 power steering control valve and a 67-68? I tried to look on the net, the only difference I found look that the 65-66 is more of a box shape, then the 67-68. I also found the numbers 6enuix on mine, but they are worn badly and I'm not sure they are correct. I am replacing my power with manuel, so I need to buy the manuel steering adapter but they make two? HELP....