multi21

Does the 04 GT3 have sometype of factory spare (I know it doesn't come with one...) or a secondary market maker of a donut tire instead of a can of goop?

I'm not comfortable going through the desert with a can of crap.

9Eleven

No. Buy a can of fix a flat and live like dangerously.

Phokaioglaukos

I have one for my GT3. It was made for the turbo with PCCBs I think, but it fits. Got it from my dealer with the jack and other tools as part of my order for the car. Not cheap.