few hits came up on Car-part.com. I want to say the 2 door and 4 door cutlass and regal shared the same rear bumper pre 1981.
https://cpprohomeky.car-part.com/image?seller=6185&partGUID=6185-2-718317&vehicleGUID=6185-2-V20851&display=1978 Buick Regal Rear Bumper Assembly-Stock# DU0028#
The rear bumper on this car looks mint .... too bad its in Colorado. There was a Cutlass in Dayton Ohio with a nice bumper as well. Re-chroming stuff is a very very expensive process north of the border
there was a member down around Hamilton that was stockpiling gbody parts. 442kid. Still see the occasional ad on Kijiji
https://cpprohomeky.car-part.com/image?seller=6185&partGUID=6185-2-718317&vehicleGUID=6185-2-V20851&display=1978 Buick Regal Rear Bumper Assembly-Stock# DU0028#
The rear bumper on this car looks mint .... too bad its in Colorado. There was a Cutlass in Dayton Ohio with a nice bumper as well. Re-chroming stuff is a very very expensive process north of the border
there was a member down around Hamilton that was stockpiling gbody parts. 442kid. Still see the occasional ad on Kijiji