Nope, it won't... 99-04 cars all have a smaller diameter neck than the aeromotive tank allows. I took a brand new grommet that i just got for my glenns tank, and placed it in his tank and it definately won't work. The '99 grommet will not work because it is tool small and will not allow a nice seal.I have one off of my 99 that worked with a Cobra tank. I would think that it would work with any 94 and up car. $25 plus shipping.