alternator brackets?

It would help if we know what year your car/ engine are. If you have the large frame 105-larger amp alternator like this:

http://www.mopartruckparts.com/images/alternator.jpg

then you surely have the later water pump/ pulleys. I would think that a later pu/ van bracket would work, as long as you get "all" of it, IE the bracket, tensioner, spacers, etc.

I'm using "van stuff" on my 67, but then I did get it all out of a van, including pulleys.

Earlier round back, or later square back use the same mounting.