I think the "0" line will be the very front of the firewall (and at the top of the firewall) at the centerline of the car. Find the centerline, measure 3" forward along the centerline from the top and face of the firewall, then 32.23" perpendicular from the centerline to the centerline of the 1/2" dia. cable hole on the fender. Other holes referenced from that. I would measure to both fenders and get it equidistant from the back of the fender on both sides to assure the line is perpendicular to the car centerline.
The drawing was surely intended for field installations of the Dealer Accessory Package.
Likely they used a template in the factory because they probably punched the holes in the fender before they painted it and long before the front end sheet metal was mated to the Body Assembly on the Final Line so couldn't reference off the firewall as they were building it. Hopefully somebody can measure off an original fender to confirm the location.
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