1982-85 chassis colors

I'm building a scale model of the silver & black 1984 Celica GT I owned back in the early 90's. I have pictures of everything but the underneath of the car. I want to make this model look as close as possible to the one I owned, so I'm hoping someone either has some pictures of the chassis or can give me an idea as to the colors of the underneath of the car [ Floorboards, suspension, gas tank, etc. ]