2 pieces of plexiglass with vent holes.  Real glass should be on the outside (front of the machine).  One piece of plexiglass is for the middle and the other for the inside so that if the door is let go before the bottle is all the way out it won't break the glass. For Cavalier bottle doors that have outside dimensions of 35-9/16 x 5-3/4.  It is  important to check your measurements.   ***RP37 gasket is needed, sold by the foot - 14' needed.