3rd pair of opto-sensors

Hi
All Circuitron products...
I want to use a 3rd pair of opto-sensors with a some of my of BD-1s. I know they should be wired in series, but want to confirm that means that one
sensor of the pair is wired between SRa and SRb and the other goes between SSa and SSb.
Is this correct?
thanks
Craig
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