Reservoir Tank - Fender Hole Pattern

More crazy stuff...what is the hole pattern (distance separation) on the driver's side fender flat surface for installation of the white Chrysler reservoir tank? Car is a 1968 Dodge Dart 270 and tank that I purchased on Ebay does not line up w/ pre-drilled holes from the factory.

Reservoir tank I have has 8 1/2 in hole separation and will almost fit existing holes . Fender has not been modified and I think I have a non Chrysler reservoir tank.

Appreciate having the dimensions from a std Chrysler tank that will screw directly onto the fender ledge. Also if anyone has a new/used tank pls provide price and s/h.

Thx...

Brattleboro VT