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I believe the 3 1/4" fitting would be suitable for larger Meades or a C11 (which I owned one before and had that size for the visual back flange fitting) and had the MoonLite focuser with the FR6.3 to suit - not sure if your SCT has that 3 1/4" threaded flange or the regular 2" one - so unless your OTA is one which has the 3 1/4" threaded flange then your choice is rather limited
HTH
Cheers
Bill
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