Originally, you didn't or at least couldn't with parts supplied by Ford. It wasn't till the '33 models that you could have two tail lamps and a rumble seat step pad at the same time. Someone makes a right hand '32 tail lamp bracket with a base that will conform to the original '32 step pad bracket. I also recall seeing recently-made step pad brackets with a cutout in them to clear the stem of the tail lamp bracket. Or you could trim the base of the tail lamp bracket to fit within the confines of the outer base of the step pad bracket. The latter is not something I'd recommend for an original tail lamp bracket given their relative scarcity.