Summit racing may have what you are asking for, but I have a few other suggestions if you are interested, and they are safer:
1) REarch the springs. Call a local spring shop and ask about it.
2) Remove front leaf spring hanger and drill another mounting hole above the existing one. You will need to position the new hole approximately 3/4 to 7/8" above the current hole to achieve the 1 1/2" of drop.