These are the clear plastic buttons that the customer actually presses on to choose which flavor of soda they would like. The buttons are hollow on the back side so the flavor strips (Uses DLAA1176 Medium Square Size) can be inserted into them.
To Change the buttons, one simply opens the machine, swing forward the coin mech. Then unscrew the brackets holding the selections switches in place, being cautious to catch the springs. With the bracket and switches out of the way the buttons push into the machine from the front. The new ones go in top first under the little lip, then replace the springs and reinstall the switch braxckets, that's it.