According to my parts book, Stage 1 up to Sept 1980 is FRC1996, and from October 1980 is FRC3924. All other models are 599288 up to September 1980, and FRC3924 from October 1980.
The only caution is that if it is an Australian assembled vehicle, it is possible that the changeover was a bit later. And, of course - does it have the original axle?
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