There is currently a display backglass in decent shape on ebay. I ended up buying the opaque yellow bumper caps from pinball resource and making waterslide decals, looks just like the factory ones. Much better than the mis-matched eight ball deluxe ones it had when I received it.
http://pbresource.com/caps/bly-snapyel.jpg
http://www.pinballrebel.com/pinball/cards/cards/Used_cards/Bally_Mr-Mrs_PacMan_bumpercap.jpg