I'm not sure what years to scavenge from, but here's Currie's offerings:
http://www.currieenterprises.com/cestore/productsRE.aspx?id=1876
http://www.currieenterprises.com/cestore/ProductsRE.aspx?id=1229
Speedway has low-buck kits, too:
http://www.speedwaymotors.com/9-Inch-Ford-Bolt-On-Rear-Disc-Brake-Kit,5336.html
Tommy