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IIRC RCA flys from CTC-7 thru CTC-16 are all electrically compatible, but not directly mechanically compatible....Essentially you can make them work, but you have to get creative in mounting it all.
pretty sure at least the 7 and maybe the 9 have more secondary windings that the Single take off used on the 12-16.
Maybe could adapt but it would not be direct wire for wire replacement even after mechanical fitment worked out.