I have pics of the clips I used....
lets see if that helps?

the first two pics are of the rubber filler as now sold,with the Chrysler headliner clips I found in "Help" section....the other two are a real 'masticated' filler, (see the difference?) and the original GM clips used...(hard to find)....hopefully you can at least see what how they fit....on either side of the bottom of the radiator, where there`s a rounded triangular shaped 'hole'...there are 2 (3?? , I think 2) holes ea side for the clips to fit in....