More than a couple of months. The schedule was locked in for a couple of months ahead! They would have to have designed, organised, tendered, awarded and received the graphics. This would have involved committees etc. Then placed the cars in the schedule which is what triggered all the parts to be either made or procured. To get them built in early 1975 you'd be looking at least back into mid 1974 to pull the trigger, assuming the whole thing was designed ready to go.
Just had a thought, is the actual Sadlon vinyl in athe Gpak the same vinyl used on other Holden and Torana?
I suspect it was std 8VB69 black trim.
All Holden & Torana decals and spray masks were manufactured by Cutler Brands in SA during the 70's so the procurement process was possibly fairly simplified.
Edited by S pack, 26 September 2016 - 01:30 PM.