Need Filler Tube location on 78 F150 Stepside

[Ol' Blue]

I recently purchased an aftermarket fiberglass rear fender for my 1978 F150 Stepside (left side). However the fender did not come pre-drilled, and although I think I have lined it up fairly well, I would rather make sure before I cut it in.

I am hoping someone could be kind enough to give me a measurement on this location. If you have a similar truck, and could give me the distance from the bottom of the fender to the bottom of the hole, and from the side of the fender (where it touches the bed) to the side of the hole, I would greatly appreciate it.

Thanks.