firstoldsmobile

Hi out there
Have an 80 442. In need of bumpers.
Obviously the front bumpers have the turn signal lenses in them and only a 80 Calais is correct.
In looking at say a 83-84 4 door sedan Cutlass bumpers look the same.
Will they work? I know I'd have to drill holes in the inner core for the filler panel to push clip.
How about rear bumper? I'd assume all 78-80 rear bumpers?
Any other GM rear bumpers work?
Thanks for anyone's time