Consider the following when replacing your Butler heat resistant stove glass.

Remove the broken stove glass by loosening the retaining brackets, if the screws are too tight then heating them up with a blow torch will help. It is a good idea to vacuum the door area and then wipe all surfaces with a damp cloth - this will remove debris which can act as a pressure point and can cause the glass to crack (and you thought it was gremlins).
Inspect the thermal rope or tape and replace if damaged. With thermal rope you will need to measure the diameter of the rope or the groove it fits into and use this to order a replacement. If you have tape, then again measure its thickness.
Install the new replacement stove glass and tighten the brackets - friction tight to allow for expansion when the glass gets hot.

Inspect the thermal rope or thermal tape and replace if damaged or worn. Install the new stove glass / heat resistant glass and tighten the brackets only FRICTION TIGHT so to allow for expansion when the glass heats up.