Shifter Bolts Broke HELP!!

You can drill and use an ez-out to get the remainder out of the bolt out, that would be best IMO. Where these the front bolts or the rear bolts?

Worse case scenario you can drill and tap to the next larger size, there should be enough meat on the tranny. Or install threaded inserts an use the stock size 3/8" bolts if I remember correctly. Don't forget to put sealant "permatex" around the housing area before you install the new shifter or it will leak.