I have attached some photos of Holden Engineering Department drawings for HZ spoiler installation. Sorry I am unable to just scan these ATM. The first photo shows positioning for "air dam clearance holes".
The second photo is instructions for the fitment of the front spoiler.
The first instruction on the second photo, fitment, is to "rework front end panel to instruction drawing SHT JI-70" Photo 1. I believe that this means that it was a production instruction, therefore part of the production line.
Hope these pics help.
JB
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