Can anyone give me a part no. for the nutserts that are inserted into the rear body cappings on a D90? The fiberglass top, upright bars and rear tailgate bar clips screw into these and I need to install all new ones in my new rear quarter panel capping. I think they're M6 size. I have a bunch of standard size nutserts but would like to stick with what's on the original capping. I've attached a couple pics of what I'm looking for. Thanks.