So I want to do HID lighting on my car and I found a good kit but they don't offer the Light canisters, Does anyone know what dimensions are needed to fit properly in the 88 gxl s4?

Here is the link to hella Conversion Headlamps

http://www.myhellalights.com/index.p...sion-headlamp/

 

Those will fit in your car but won't work with a hid bulb you need to use a standard halogen.