Originally Posted by chatham
no original body. would be great if you can find something keith.
The filler is centered under the tail light, which you can locate based on Keith's picture. The filler hole is almost exactly inline with the tailgate opening too, where the bottom of the cutout lines up with the tailgate bottom. Trace that onto the tub and you'll be very close. (That assumed you sprung for the tub with tailgate like I did).
On my tub, I stuck tape on where I was going to cut the tails, traced the shape, and cutout just smaller than I thought I'd need. I made small adjustments until I could fit the filler.