Best place to buy a front end rebuild kit

I am looking for the best place to buy a complete front end rebuild kit for my 71 Dart Swinger. I am going to take a LBP disc set-up off of a 73 Dart Swinger so I will need some parts for the 71 and some for the 73, right? Is there a company that will know what all I need and sell it in a kit form?

THANKS


P.S. Should I get a standard kit or the polyurethane/polygraphite type?