1967-1968-1969 Barracuda Rear Trim?

If you have the long 2 stud fasteners for the center panel, you're golden. The 2 narrow trims use common multi-application 10-24 T studs. Mister Gs fasteners has them. Your local body/paint/jobber supply might have them as well. The correct nuts, ALL OF THEM ,should have seals.
The very end studs need be shorter ( about 5/8 inch ) than the common off the shelf length ( 3/4, 1 inch ) so they don't dig into the body. These shorter end studs got a closed nut too so they don't grab wedding rings, etc..., so easily.