They fall off. Kirbans has those too.Also just noticing some internet parts reference to waste gate solenoid filter at the passenger' valve cover. My car does not have a filter on that top nipple. Some pics of GNX's on line have a filter and some don't. I am wondering if these little filters were only on Grand Nationals and not GNX? Looks like it is something that could fall off easily.
By looking at several other GNX's on-line I was able to find GM part #559547 which is sort of a round white plastic barrel. I used these for the top attatching point as in photos I saw and they snap right in the upper bumper square holes easily without force. I then used the typical white flat squares for the bottom holes on the bracket. I believe this to be the correct application at least looking at other GNX front photographs.They fall off. Kirbans has those too.
1986 1987 Buick Regal Grand National Turbo T T-Type GNX GM Factory Original WASTEGATE SOLENOID FILTERS (3) KIT #7091Best deal on GM Factory Original WASTEGATE SOLENOID FILTERS (3) KIT #7091 in the ENGINE, FUEL and IGNITION PARTS category at KirbanPerformance.comwww.kirbanperformance.com