The instruction card sits on bottom right side of the translucent (ie: clear) area of the bezel. The parts catalog instructs an operator to have card taped on the inside of the bezel. See Clowns parts catalog on page 1 or in the .pdf file page 3 on bottom of the page.
There are three different selections to choose from on each card making a total of 9 different card instructions. There are peforations on each section of each card making it easy to avoid ripping the instruction card when tearing off a section to place on the inside of the Clowns bezel piece.
btw: I am certain the MAME artwork.c source file might have to be updated to reflect instruction card pieces as a separate item from the bezel piece. It wouldn't be ideal to have 9 different Clowns bezels (each card has 3 different instructions) because of each instruction card being different.