Looks like the VIN 1 designation was only used for a few models in 1979. As far as fitment in a Fiero, haven't any clue.
1979 Chevrolet Monza 2+2 Sport; 4 Cyl 2.5L; "VIN 9"
1979 Chevrolet Monza 2+2 Spyder; 4 Cyl 2.5L; "VIN 9"
1979 Chevrolet Monza 2+2; 4 Cyl 2.5L; "VIN 9"
1979 Chevrolet Monza Base; 4 Cyl 2.5L; "VIN 9"
1979 Chevrolet Monza S; 4 Cyl 2.5L; "VIN 9"
1979 Chevrolet Monza S; 4 Cyl 2.5L; "VIN V"
1979 Oldsmobile Starfire Base; 4 Cyl 2.5L; "VIN 1"
1979 Oldsmobile Starfire Firenza; 4 Cyl 2.5L; "VIN 1"
1979 Oldsmobile Starfire GT; 4 Cyl 2.5L; "VIN 1"
1979 Oldsmobile Starfire SX; 4 Cyl 2.5L; "VIN 1"
1979 Pontiac Sunbird Base; 4 Cyl 2.5L; "VIN 1"
1979 Pontiac Sunbird Base; 4 Cyl 2.5L; "VIN 9"
1979 Pontiac Sunbird Safari; 4 Cyl 2.5L; "VIN 1"
1979 Pontiac Sunbird Safari; 4 Cyl 2.5L; "VIN 9"
1979 Pontiac Sunbird Safari; 4 Cyl 2.5L; "VIN V"
1979-1980 Chevrolet Monza 2+2 Sport; 4 Cyl 2.5L; "VIN V"
1979-1980 Chevrolet Monza 2+2 Spyder; 4 Cyl 2.5L; "VIN V"
1979-1980 Chevrolet Monza 2+2; 4 Cyl 2.5L; "VIN V"
1979-1980 Chevrolet Monza Base; 4 Cyl 2.5L; "VIN V"
1979-1980 Oldsmobile Starfire Base; 4 Cyl 2.5L; "VIN V"
1979-1980 Oldsmobile Starfire Firenza; 4 Cyl 2.5L; "VIN V"
1979-1980 Oldsmobile Starfire GT; 4 Cyl 2.5L; "VIN V"
1979-1980 Oldsmobile Starfire SX; 4 Cyl 2.5L; "VIN V"
1979-1980 Pontiac Sunbird Base; 4 Cyl 2.5L; "VIN V"
1980 Chevrolet Monza Spyder; 4 Cyl 2.5L; "VIN V"
1980-1981 Oldsmobile Omega SX; 4 Cyl 2.5L; "VIN 5"
1980-1982 Buick Skylark Base; 4 Cyl 2.5L; "VIN 5"
1980-1982 Buick Skylark Sport; 4 Cyl 2.5L; "VIN 5"
1980-1983 Buick Skylark Limited; 4 Cyl 2.5L; "VIN 5"
1980-1983 Pontiac Phoenix Base; 4 Cyl 2.5L; "VIN 5"
1980-1983 Pontiac Phoenix LJ; 4 Cyl 2.5L; "VIN 5"
1980-1981 Oldsmobile Omega Base; 4 Cyl 2.5L; "VIN 5"
1980-1981 Oldsmobile Omega Brougham; 4 Cyl 2.5L; "VIN 5"
1981 Oldsmobile Omega Sport; 4 Cyl 2.5L; "VIN 5"
1981-1983 Chevrolet Citation Base; 4 Cyl 2.5L; "VIN 5"
1981-1983 Chevrolet Citation X-11; 4 Cyl 2.5L; "VIN 5"
1981 1983 Oldsmobile Omega ES; 4 Cyl 2.5L; "VIN 5"
1982 Chevrolet Celebrity CS; 4 Cyl 2.5L; "VIN 5"
1982 Pontiac 6000 Base; 4 Cyl 2.5L; "VIN 5"
1982 Pontiac 6000 LE; 4 Cyl 2.5L; "VIN 5"
1982-1983 Buick Century Custom; 4 Cyl 2.5L; "VIN 5"
1982-1983 Buick Century Limited; 4 Cyl 2.5L; "VIN 5"
1982-1983 Chevrolet Celebrity Base; 4 Cyl 2.5L; "VIN 5"
1982-1983 Chevrolet Celebrity CL; 4 Cyl 2.5L; "VIN 5"
1982-1983 Oldsmobile Cutlass Ciera Base; 4 Cyl 2.5L; "VIN 5"
1982-1983 Oldsmobile Cutlass Ciera Brougham; 4 Cyl 2.5L; "VIN 5"
1982-1983 Oldsmobile Cutlass Ciera LS; 4 Cyl 2.5L; "VIN 5"
1982-1983 Pontiac Firebird Base; 4 Cyl 2.5L; "VIN F"
1982-1983 Pontiac Firebird S/E; 4 Cyl 2.5L; "VIN F"
1983 Buick Skylark Custom; 4 Cyl 2.5L; "VIN 5"
1983 Oldsmobile Cutlass Ciera ES; 4 Cyl 2.5L; "VIN 5"
1983 Oldsmobile Omega ESC; 4 Cyl 2.5L; "VIN 5"
1983 Pontiac 6000 Base; 4 Cyl 2.5L; "FI, VIN 5"
1983 Pontiac 6000 LE; 4 Cyl 2.5L; "FI, VIN 5"
1984 Buick Century Custom; 4 Cyl 2.5L; "FI, VIN R"
1984 Buick Century Estate; 4 Cyl 2.5L; "FI, VIN R"
1984 Buick Century Limited; 4 Cyl 2.5L; "FI, VIN R"
1984 Buick Century Olympia Limited; 4 Cyl 2.5L; "FI, VIN R"
[This message has been edited by fieroguru (edited 11-26-2013).]