61 Ford power steering question

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I am putting an o ring kit in a full size 61 Ford power steering control valve. My question is about the spool valve. I kept things in order until I washed parts. The question is now I notice the spool valve has one end that is about .500 and the other is about .564. Does the larger end go toward the end dust cover or the smaller go to the end dust cover? (Dust cover near the left tire.) Does anyone have a good break down of assy? I have looked at some pic's but they don't really show size difference. If some one has a control valve they could remove the end cap and thin plate and measure that end of the shaft that would answer my question. I'm thinking 60-64 Ford & Mercury big car and maybe others. should be about the same. This spool somewhat resembles mine. If you need to send pic. email to

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