They don't exist in HT to HG parts books. Both exist in the images in the 1971 HQ parts book but not in the text. They are called:
ARRESTOR - rear side mounting (the black bits in Rob's photos).
ARRESTOR - rear mounting (the strap).
In later parts books (late HQ onwards) they appear in the text in section 4.081 for Aussie boxes and Trimatic:
2819856 (rear mounting) quantity 1.
2819855 (rear side mounting) quantity 2.
Rob, the images show it the way you have it in the second image. But I don't reckon you use them on low power and/or low weight applications like a Torana and they are not shown in any of the LC-LX parts books in images or in text. My guess is they were introduced due to the cab-chassis. They are shown in the CF Bedford Parts book too.
Edited by yel327, 13 November 2023 - 12:34 PM.