As for the 4 sp shift knob.... I am in Brisbane for the next week and don't have my parts manuals with me but I am willing to bet that the part number will not be the same for HQ through to HZ.
I can't answer it all but I can tell you HJ and HX gear knobs share the same part numbers. You're right about late HZ having the golf club UC Sunturd gear knob.
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