What i am going to do with my cuda lenses is prep the lenses i have for the studs, glue the studs in with the JB weld, and put some wheel bearing grease or vaseline on the mating surface of the reflector/bulb holder part where the studs go through. Then fit the pieces together maybe tape em together so they dont shift while the adhesive is drying, and adjust the studs while the JB weld is wet to center them in the holes of the reflector. When dry the grease acts as a mould release to get it back apart.
Dont forget to cut the studs to the length your going to need before gluing , since it will be pretty hard to do it afterward, and a cutoff wheel will get the metal studs too hot and melt the plastic.