We need a 3rd gen Monte expert to chime in. The third gen ran from 78-80 but there were minor styling differences. My guess is yes, but I can't say for sure.
I'm not a 3rd gen expert but.....I do know 1978 & 79 fenders are the same, 1980 had the side marker marker light below the "Monte Carlo" script. A 78/79 fender will line up fine you just will not have the side marker light hole.
Bumper covers all interchange, although I have seen ones with a ridged area under the headlights while my two Oshawa built cars are smooth. Sorry to say the header panel is a 1 year only part.
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