The Lights are 3" in diameter and so is the fog light opening of the svt bumper. Its a perfect fit. No gap at all. As for the colors, if you want green, just get the color changing one and leave it on green. It won't be an inconvenience. It will stay green on every start up. Just don't change colors.

AIM...BKapp17 98 T-red SVT Steeda Gutted Pre-cats, no resonator Painted Dash Angel Eye Fogs Painted Chrome ring / headlights Looking for a t-red pre98 trunk lid