there should be an instruction booklet with ur cooler kit and it will tell u where to cut the hole in the car.
some reo usually always needs to be cut, i cut about 1 cm off of mine
ur front bar will need a trim i had to cut about 1.5 inches out of it to fit
however i have heard of some ppl not needing to cut either it just depends on the specific kit u have and how well it lines up (mine was ok at best)
i dont know what nipple thing u r talking about
cheers
julz