Identify this Amphib?

Can anyone identify this amphibian by type or tail number?

Obviously twin turbo with far outboard tip floats and large, square vertical stabilizer. Observed in Oklahoma about March 21, 2016.

Painted underneath was “262” but it’s clearly not N262.

Thanks!

Gregg Carlson/N260DJ

http://www.carlsondesign.com/clip1.jpg

en.wikipedia.org/wiki/Bombardier_415

It is N389AC,for US Forest Service Fire Fighting,by Aero Flite.