The JC Whitney kits that Nexxussian mentioned were sourced from Quick Start.
http://store.alternatorparts.com/repair-kits-and-upgrade-kits-2.aspx.If you simply want to rebuild, they have that for you also.
http://www.alternatorparts.com/Their web site is huge and can be hard to navigate, but if you've heard of it, they've got it.
