By the sound of it the bolt has been crossthreaded in there tight enough to break it off. You won't get it out with an easy-out. If you can avoid using the passenger seat until you get the steering rack done I'll drill it out and re-tap it for you, if possible. Otherwise it needs a patch and nut welded on etc which is more work but still do-able.

Edit; For anyone wondering what an Ezy-out is, or how to use one they have their uses but are not a miracle cure for all broken bolts. For instance if you're bolting on a bracket and overtighten the bolt and break the head off you may well be able to use an Ezy out. The reason the bolt broke was that it was overtightened, and stretched to breaking point, it will not be tight in the threads once the head has broken off.

On the other hand if you bought a coarse thread bolt from Bunnings for your fine thread pitching stopper and it breaks off after you have sweated and graoned through five turns of thread munching (Hi Tino!!) you've got buckleys of anything with the word 'ezy' getting that out!!!!