CRXs came in silver in both generations, however I am only sure silver was an Si color in the late 1G cars. Maybe the '88 too, but I'm not sure. Is it a first or second generation body?

Edit: OK, I did a little research for you, looks like the 87 (1G) and the 88 (2G) were the only years that silver was availible on an Si model CRX.