1981-88 Cutlass Hood Trim Fender Extension. These parts replace GM part #'s 22512186 LH & 22512187 RH.
This is the part that commonly falls off the rear top of the fender. It goes in line with the rear trunk trim. This was designed to follow & continue around to the wide molding on the top of the cutlass doors.
Some 78-80 have these but are only one prong. The slant back roof style uses that. This is a 2 prong unit.
Although never offered on a Buick it would function the same way. $27.95 a side or $50.00 a set.