Why isn’t the hole already there?
Did it get welded closed?
Anyway someone needs to get you a good photo of the whole inner fender with the hole
But I would suggest getting as many data points as you can first
This sort of detail could be one of those situations where is no single correct answer and you find hole location variations
But who knows, let’s see what happens.
I’m not near my truck by I recall it was “in the middle about” lol
Aren’t you really close to turners auto wrecking?
Maybe go check them out with a tape measure in hand
Fresno down town is 6 miles from one of the best junk yard in America for these old trucks
I’m envious of your location
-s