Designed around these replacement lights for JK - https://www.amazon.ca/gp/product/B01AJ2H4U2/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
Should probably print these in either petg or abs if your location gets warm. Use the print as a template to drill 4 mounting screws and a hole with the aid of a 3" hole-saw, bore it out with a rotary tool. Then just push the light in(pay attention to orientation) and bolt it on. You may want to remove your headlights to get hand room inside the grill(if installing on a jeep tj).
Yes my grill is beat to crap, that's just the mark of a well loved jeep :)
*white on yellow looks terrible, I'll update the post once I flexidip them black (maybe paint my grill, depending how ambitious I feel tomorrow).