Got the marquee, bezel glass, and CP overlay, and translucent blue buttons from Arcadeshop.com
Had to use Goo Gone (the citrus smelling stuff) to get all the glue off... very tedious... but it worked... just spay on a small area, then let soak for a few minutes, then scrape with one of those razor blade flat scrapers... you may have to do several passes on each area.
Had to patch up existing button holes, and the player 2 button hole, which had been drilled through... usually Williams CPs will use the short leaf switches. These need a 1-1/8" hole about halfway thru the CP, then a smaller hole (5/8" I think) all the way thru so the PAL nut holds it in place... I also had to do a 1-1/8" counterbore of about 1/8" deep from the bottom of the CP so that the PAL nut could catch the threads...