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I was unaware Celestron had manufactured SCTs with 0.965" eyepieces!
They did, actually. The Celestron 5 came that way by default when I bought mine in 1980; Orion Telescopes was able to change it out to have a Celestron 8 visual back and 1.25" eyepieces, at my request. I believe the C90 initially came with 0.965" eyepieces too.