Only the very early '74 cars had no door intrusion bars.
Are you sure Col? My father's LH is a 9/75 and the doors have no intrusion bars (well the original ones don't).
A wipe with some bog over the spot welds & i doubt anyone would know the difference.
Am i sure? No.
I was always led to believe that ADR29 (side door impact) was implemented around 6-74.
After a quick look around i can only find reference to it coming into affect 3-76.
From what i can gather, it was up to each State as to when they complied, as long as it was pre 3-76.
I can't see GMH building cars to suit each State ( only putting ADR29 into say .... a Melbourne car but not in a Brisbane car to save a bob ) but they certainly had enough notice that ADR was coming into play.
Here is where i get confused: The ADR's are listed numerically on the body tag.
ADR 29 is 3-76, but ADR27A (pollution gear) shows as 7-76?
I wonder why it took 4 mths to nut out 27A when 29 was already in effect?
I wonder if the tags on those 4mth cars have 27 & 90?