Hi Blue 50,,,if youve tried an e-z out and its not working,,try drilling the broken bolt with the size just smaller than the diameter of the orig bolt. (i think theyre 5/16 or 3/8)
Whichever the case may be,,,,drill the hole to where all you have left is only the old threads from the old bolt. Then run a tap thru there to clean out the hole,,and,,voila!! new hole ready to accept your new bolt.
Hope this makes sense.
good luck,Marty