Is it a bulb in the door or under the dash on the driver's side? I don't know if my 99 SVT is any different in the lighting area, but I changed all of my interior lights to red and if it is the one under the dash, then it's easy. You just pull the bulb out and put the new one in. It would be a 168 or 194 I think. I think it's supposed to be 168 but 194 will fit. If this helps, cool. If not post more info. and I'll give it a shot.