First off, do the cylinder heads have the tapped holes in the end of the head or are they totally smooth? Do you want the alt. on the left or right side? Do you want "pretty" parts or will "stock" do? What are your exhaust manifolds like?
On engines without the tapped holes, the factory ramhorn manifolds had provisions for mounting the brackets. If you don't want to run these manifolds, then you will either need to make/modify brackets or pay for some "fancy" aftermarket type bracket setup.
With the head holes, life is less complicated. Even JC Whitney carries the cheap chrome stuff, as does some of the bigger parts chain stores. Usually there's someone selling this stuff at any of the larger swapmeets also.
