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AJ/FormS said

66s and older, IIRC, have a different front end and won't accept 67 up convertors; jus saying

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The difference is in the spline count on the input. 19 on the early models 24 on the later.Changed in 67. This is on BB. SB used a smaller convertor register on the early models. I think 66 or 67 was the split