The clip has a .670" wide x 1.380" long top plate with a 10-24 threaded stud that 7/8" long. The mastic sealer nut has a 3/8" hex and a 5/8" diameter flange.
Replaces the GM part numbers 4673604 & 4726936.
New Old Stock Auveco.
1956 1957 1958 1959 Chevrolet & Oldsmobile.