Thanks. So all you need is one template and flip it for the left side?But it was a custom up grade to a lot of full size convertibles of the era back when FM first started broadcasting. You use symmetry to find the second hole location as it will be in the exact same location (as noted on the template in terms how far it is from what) only flipped to the other side of the car. So you just have to locate the first hole (which from memory was on the passenger side).
The second antenna is a dummy as you only connect one antenna to the radio for reception.