The requirement for tow bars to be plated only applies to vehicles manufactured after that ADR. Almost no vehicle standards are retrospective - the only one I can think of is rear reflectors.
Hence plated towbars are not required on any Series Landrovers (or indeed on pre-Defender coil sprung ones), in the same way that seat belts are not required on those made before 1971(?).
All, or almost all Series Landrovers sold in Australia were fitted from new with the standard towing jaw 90518674, which was fitted to almost all export S2/2a/3 Landrovers, except wagons.
While designed for a ring connection, a standard towing ball fits perfectly well instead of the pin. I have added to mine a second nut to distribute the load to both parts of the jaw - this has welded into the bottom of it a pin the thickness of the jaw and the same diameter as the hole in the jaw, and the pin has a threaded hole tapped in it so it is secured by a 5/16" UNF bolt and heavy washer.
This will probably put the ball a little higher than is ideal, but I have towed a wide variety of trailers on these for the last 50+ years on all the Series I have owned, with no issues.
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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