The plastic bumper has about approx 8 or more clips which snap into corresponding square holes in the metal bumper mount. What I am unsure of is whether I can get all the clips snapped in with the metal bumper mount installed on the car first. I think it is possible to assemble everything off the car first (metal and plastic), slide the whole thing into the chassis, line up the 17 mm bolt holes and tighten. I have the metal mounted now so will try it that way first. Mods, if you think this thread should be moved, please do so.