I have no issues with a vehicle not meeting a state requirement. or a local regulation.. What gets me every time is when the person presenting the issue is incorrect OR provides you with duff gen. with a few varient exceptions, perenties, provided they are in a fully comliant build state with the ADR plate and the mod late attached and correctly drilled are, with the exception of the blackout lights, completely compliant with the ADR's because ADRS are not retrospective.
VSR, VSS, good luck. generally you should be ok but I wouldnt want to be passing more than a surface glance at them pick a technical aregument in those realms and at best your odds are 50/50. the best argument you have is basically, predates those rules therefore not applicable.. and even then thats not entirely true.
IF.
your ADR plate is missing, damaged, defaced, not correctly attached
your MOD plate is missing, damaged, defaced, not correctly attached and not correctly drilled
your CAPO plate doesnt match up in any respect
there is any non approved mod work or repairs using non approved parts or parts replaced with non aproved parts
then you don't have a leg to stand on, because, technical bureaucratic reasons. and trust me, they dont need very much to knock back your rego legitimately.

