Below the color codes I know:

The early Sports (70's): Fiat 152 (Rosso Vivo)
Later Sports (80's): Fiat 120 (Rosso Corsa)
Blue metallic, first Strada: Nissan Turqouise Blue metallic
Red metallic, first Strada: Honda R 218 M Radiant Red -
on white primer!
Green/golden: Glasurit: my 032.20
Brown metallic:
Ford Roman Bronze Metallic
Grey rims: Ral 7040
"Gold" rims:
RAL 1036
© Søren Høyer Hansen Wellcome