Steve I have to ask why don't you like the coffee can tank?
They do tend to rust from the inside out, don't know why?
But it can be fixed and yes I did.
Pull the mounting bracket off, clean up the outside and give it a few coats of fiber glass rosin.
Once it is sealed paint, put the mounting bracket back on and install in the truck.
You still have the factory vacuum can mounted to the fender.