Quote Originally Posted by Blocker View Post
ADR 25 is in reference to Anti Theft locks, it has nothing to do with steering wheels.
You may want to refer to ADR 10—Steering Column;
The function of this Australian Design Rule is to minimise crushing or penetrating injuries to drivers due to the ‘Steering Column' as a result of frontal impact.
Blocker, there was a change to ADR 10b concerning steering wheel crush strength that came into effect on 1st Jan 78 at the same time ADR 25a came into effect. GMH used the ADR 25 and 25a as a way for service dept. to know which cars had the new steering wheels as it is a change noted on the compliance plate.

part number 2817164 (5mm black sports type steering wheel) is listed in the HZ parts manual as use prior to ADR 25a.

part number 92003716BA (3mm black sports type steering wheel) is listed in the HZ parts manual as use with ADR 25a

part number 92003716BA is also listed as superseding part number 2817164

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