Hi. The shay pinball group has been making backglasses since I have been in the hobby (about 20 years) and they make the best, hands down. Anyway they specialize in the EM era, and they have many of the really collectable/expensive games from that era.
The thing I like about shay bg's is they look great when lit from behind, and they look the same as the originals.

So, the reason I am giving them this free advertisement is because I traded one of my pf for a credit, and I will have a hard time using the remainder. So if you want to buy a BG from them, and go thru me, I will cover the shipping. Not a bad deal! Plus you are supporting a pin company that has been in the biz since before many of todays collectors were born. I will say from experience that their backglasses are collector quality.
here is their website, and contact me if there is anything you want

http://shayarcadegroup.com/index.html

also if they don't have a title from the em era that you need, many times they do have one in stock from a run they did 15 years ago, so it doesn't hurt to ask.

MY email is
[email protected]

Thanks, and cheers