Williams/Bally Rubber Bumper Plug/Grommet$ 0.76 Add to cart Categories: Door Locks, , Fabric&Fleece Backdrop, Sound Healing This bumper plug/grommet is used on Williams/Bally flipper brackets/mounting plates. Williams/Bally reference #23-6577. American Pinball reference #RBR0011-00. Related products CV Joint Grease Satchet DBC400 STRETCHY Direct Fit CV Boot Kit DBC500 STRETCHY Direct Fit CV Boot Kit DBC600 STRETCHY Direct Fit CV Boot Kit