I have swapped my car from HEH-E (close ratio) to HEH-B (wide ratio). Both used the correct-length tailhousing (same casting). As stated by others, the speedo gear opening is on the LH side. Dunno where the HEH-CF comes from, as my factory service manual says otherwise. One other tidbit; the correct mechanical speedo gear is green. I’ve seen the yellow one substituted on an already-rebuilt unit, undoubtedly because it costs half as much (much more common).
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