BAGGIN MY 67 GMC ?'S

I AM NOT AN EXPERT ON BAGS. MY TRUCK IS A 67 GMC 2WD SHORT BED. THE REAR SUSPENSION IS LEAF SPRINGS FROM THE FACTORY, UNLIKE THE 67 CHEVYS, MORE LIKE THE 66 CHEVYS (I DON'T KNOW IF THAT MATTERS. ALSO, IT HAS BEEN CONVERTED TO 5-LUG. ANYWAY, WHAT ALL DO I NEED/NEED TO DO TO BAG' IT FRONT AND BACK? I WANT TO BE ABLE TO LAY FRAME WITH 20'S. DOES ANYONE MAKE A KIT FOR IT? I WANT 1/2 INCH LINES. ANY HELP WOULD BE GREATLY APPRECIATED.