In case it hasn't been mentioned here before, there is a document on the National Archives of Australia repository with a lot of the original jig drawings and some parts drawings for the LP2A. Here is the page showing the accelerator pedal assembly (the URL is pretty awful and takes a while to load - I hope this works):
https://recordsearch.naa.gov.au/Sear...4517&T=P&S=173
If that doesn't work then search the naa site for:
Title [Plans and specifications for Armoured Fighting Vehicles]
Contents range 1941 - 1943
Series number MP392/8
Control symbol 5
Access status Open
Barcode 364517
The accelerator pedal is page 173 of 239. The jigs go up to about page 145 or so, then some parts from there.