Well thanks @Oldtimer
I'm pretty sure that I can fab a bracket that looks like that. And thanks to @toddz69
for the reference to Toms's. Because that got me to their reservior page, and that got me to see the listing for the TWO different bottles used. So we get one colored bag in 66, then another colored bag in 67. Then the Mustang sloped bottle from 68 to 70. Then we get the 71-77 Bronco bottle with the vertical lower mount that requires a special dimple in the inner wheel house.
Which is why my 71+ windshield washer reservoir won't fit my 70 apron. And why most of the aftermarket wheelhouses are built wrong. Because there is a 66-70 with no dimple, a 71-73 with dimple, and then a 74-75 with PS shaft relief and dimple, and the 76-77 with the relief, dimple, and dent for the booster.
So watch out when you buy a 66-75 inner fender!