I will be posting this information in the Buy, Sell, Trade thread as well, in case someone is looking for these. I've read many posts where people have asked where to find this stuff, and after searching the threads myself, and not finding any answers, I found it myself. I decided to post the info for the next person searching the threads. I am not affiliated with the site.
While restoring my Twin Battlezones, I found that, despite having a big box labeled "Battlezone handles", it turns out that I had only one good rubber grommet for four handles. I've seen quite a few remarks on how hard it is to find these things, but after a lot of searching using various terms for joystick and grommet and Battlezone, I finally found them!
http://www.wizzesworkshop.com/cart/default.aspTom at Wizzesworkshop has a small list of parts, but some may be hard to find elsewhere. You will find them in his catalog on his site.
Under his Game Replacement parts he lists:
Joystick centering bellow for BZ, RB, & FF: $11.00
Joystick centering spider for Sinistar, Archrivals, etc. $11.00
Battlezone color films: $15.00
Asteroids Deluxe color films: $15.00
He has some overlays:
Asteroids Control Panel Overlay: $18.00
Asteroids Deluxe Control Oanel Overlay: $45.00
Tapper Handle Artwork: $5.00
Tapper Control Panel Overlay: $45.00
Marble Madness Control Panel Overlay: $45.00
He also has a MCR-to-switcher adapter board for $45.00
I ordered 3 grommets and will report on how well they work when I get them.
Just thought I'd give a heads up in case anyone else is looking for this stuff besides me.