there are many types of bushings out there. post pictures of the arms.
if the aftermarket arms used Clevite bushings, you may be able to get the part number off the side of the bushing and get them at NAPA.
if the aftermarket arms used polyurethane bushings, you can call Daystar with the dimensions, and they may make bushings of the proper size. but honestly, if you have polyurethane bushings just buy new control arms.