hey how do you mount a group a front spoiler on to the oranigal front bumper
hmm, the old bumper has to come of firstly!!
you mean how do you mount it to the support bar??
your group a bar should have mounting points? if so find a bolt that fits the thread in side the bar and screw her on(you may have to drill new holes in you support bar to suit the group a bar,make sure you use washers so you can adjust it),and you can also use the side clips from the original bar to the group a bar.