5 ml wheel with a 77 date code..which just talking to dr terry would be around the time side intrusion/crash protection adrs came in and from what can be figured out 3ml wheels started then..so mid hx.
pic above is 3ml wheel with hz cap.
interesting reading and a all the australian design rule numbers are in this link http://www.infrastructure.gov.au/roa...n/pdf/vol1.pdf
side impact adr was january 1977
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