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I pulled it from a truck in the salvage yard. Would my best bet be to try and measure the hole in from the parts truck?
Do your best to make a template from the parts truck. Using faded paint, wear marks, tracing paper, tape measure and anything else you can use to make a good template from. Measure on the cowl from here to there. Here's where tracing paper comes in handy. Hopefully you understand what I'm getting at. Good luck
Wide masking tape also works good....stick it over the holes, (make some reference marks at the edges) mark with a sharpie. Then peel and stick to your truck in the same place.
Also, I have a spotlight on my '62 if you need some pics....