I broke the original glass door panel when I was trying to tighten the over door handle (which had become loose). I didn't realize the screw bracket tightened directly against the glass until it was too late and it shattered. Expensive mistake.
I found the replacement panel on ApplicancePartsPros and had it in 2 days. Replacement was easy. Make sure you follow owner's manual on removing the oven door so you can easily reinstall the new outer panel (it requires flipping latches on the door hinges, but then lifts right out).