Archived from groups: rec.games.pinball (More info?)
I use the ones from Mayfair ($15). It is not an exact fit and will need
to bend channel and fill with some kind of silicone caulking. You will
probably need to sand the channel it goes into as well. Unfortunately
these are the issues with a NOS BG. I had a friend of mine do my
Embryon. He has done several to date. Good Luck!